diff --git a/src/mayo_1/api.c b/src/mayo_1/api.c
index a7bb712..b7e2ef8 100644
--- a/src/mayo_1/api.c
+++ b/src/mayo_1/api.c
@@ -14,7 +14,6 @@ crypto_sign_keypair(unsigned char *pk, unsigned char *sk) {
     return mayo_keypair(MAYO_PARAMS, pk, sk);
 }
 
-#ifndef PQM4
 int
 crypto_sign(unsigned char *sm, size_t *smlen,
             const unsigned char *m, size_t mlen,
@@ -44,26 +43,4 @@ crypto_sign_verify(const unsigned char *sig, size_t siglen,
         return -1;
     return mayo_verify(MAYO_PARAMS, m, mlen, sig, pk);
 }
-#else
-int
-crypto_sign(unsigned char *sm, size_t *smlen,
-            const unsigned char *m, size_t mlen,
-            const unsigned char *sk) {
-
-    size_t smlen_ll;
-    int rc = mayo_sign(MAYO_PARAMS, sm, &smlen_ll, m, mlen, sk);
-    *smlen = smlen_ll;
-    return rc;
-}
-
-int
-crypto_sign_open(unsigned char *m, size_t *mlen,
-                 const unsigned char *sm, size_t smlen,
-                 const unsigned char *pk) {
-    size_t mlen_ll;
-    int rc = mayo_open(MAYO_PARAMS, m, &mlen_ll, sm, smlen, pk);
-    *mlen = mlen_ll;
-    return rc;
-}
-#endif
 
diff --git a/src/mayo_1/api.h b/src/mayo_1/api.h
index 1c23884..07a2f67 100644
--- a/src/mayo_1/api.h
+++ b/src/mayo_1/api.h
@@ -15,8 +15,6 @@
 int
 crypto_sign_keypair(unsigned char *pk, unsigned char *sk);
 
-
-#ifndef PQM4
 #define crypto_sign MAYO_NAMESPACE(crypto_sign)
 int
 crypto_sign(unsigned char *sm, size_t *smlen,
@@ -40,19 +38,6 @@ int
 crypto_sign_verify(const unsigned char *sig, size_t siglen,
                    const unsigned char *m, size_t mlen,
                    const unsigned char *pk);
-#else
-#include <stddef.h>
-
-int
-crypto_sign(unsigned char *sm, size_t *smlen,
-            const unsigned char *m, size_t mlen,
-            const unsigned char *sk);
-
-int
-crypto_sign_open(unsigned char *m, size_t *mlen,
-                 const unsigned char *sm, size_t smlen,
-                 const unsigned char *pk);
-#endif
 
 #endif /* api_h */
 
diff --git a/src/mayo_2/api.c b/src/mayo_2/api.c
index e4b5604..a7cf85e 100644
--- a/src/mayo_2/api.c
+++ b/src/mayo_2/api.c
@@ -14,7 +14,6 @@ crypto_sign_keypair(unsigned char *pk, unsigned char *sk) {
     return mayo_keypair(MAYO_PARAMS, pk, sk);
 }
 
-#ifndef PQM4
 int
 crypto_sign(unsigned char *sm, size_t *smlen,
             const unsigned char *m, size_t mlen,
@@ -44,26 +43,4 @@ crypto_sign_verify(const unsigned char *sig, size_t siglen,
         return -1;
     return mayo_verify(MAYO_PARAMS, m, mlen, sig, pk);
 }
-#else
-int
-crypto_sign(unsigned char *sm, size_t *smlen,
-            const unsigned char *m, size_t mlen,
-            const unsigned char *sk) {
-
-    size_t smlen_ll;
-    int rc = mayo_sign(MAYO_PARAMS, sm, &smlen_ll, m, mlen, sk);
-    *smlen = smlen_ll;
-    return rc;
-}
-
-int
-crypto_sign_open(unsigned char *m, size_t *mlen,
-                 const unsigned char *sm, size_t smlen,
-                 const unsigned char *pk) {
-    size_t mlen_ll;
-    int rc = mayo_open(MAYO_PARAMS, m, &mlen_ll, sm, smlen, pk);
-    *mlen = mlen_ll;
-    return rc;
-}
-#endif
 
diff --git a/src/mayo_2/api.h b/src/mayo_2/api.h
index b972e12..7c38c1a 100644
--- a/src/mayo_2/api.h
+++ b/src/mayo_2/api.h
@@ -15,8 +15,6 @@
 int
 crypto_sign_keypair(unsigned char *pk, unsigned char *sk);
 
-
-#ifndef PQM4
 #define crypto_sign MAYO_NAMESPACE(crypto_sign)
 int
 crypto_sign(unsigned char *sm, size_t *smlen,
@@ -40,20 +38,6 @@ int
 crypto_sign_verify(const unsigned char *sig, size_t siglen,
                    const unsigned char *m, size_t mlen,
                    const unsigned char *pk);
-#else
-#include <stddef.h>
-
-int
-crypto_sign(unsigned char *sm, size_t *smlen,
-            const unsigned char *m, size_t mlen,
-            const unsigned char *sk);
-
-int
-crypto_sign_open(unsigned char *m, size_t *mlen,
-                 const unsigned char *sm, size_t smlen,
-                 const unsigned char *pk);
-#endif
-
 
 #endif /* api_h */
 
diff --git a/src/mayo_3/api.c b/src/mayo_3/api.c
index 79101e4..5c42eab 100644
--- a/src/mayo_3/api.c
+++ b/src/mayo_3/api.c
@@ -14,7 +14,6 @@ crypto_sign_keypair(unsigned char *pk, unsigned char *sk) {
     return mayo_keypair(MAYO_PARAMS, pk, sk);
 }
 
-#ifndef PQM4
 int
 crypto_sign(unsigned char *sm, size_t *smlen,
             const unsigned char *m, size_t mlen,
@@ -44,26 +43,4 @@ crypto_sign_verify(const unsigned char *sig, size_t siglen,
         return -1;
     return mayo_verify(MAYO_PARAMS, m, mlen, sig, pk);
 }
-#else
-int
-crypto_sign(unsigned char *sm, size_t *smlen,
-            const unsigned char *m, size_t mlen,
-            const unsigned char *sk) {
-
-    size_t smlen_ll;
-    int rc = mayo_sign(MAYO_PARAMS, sm, &smlen_ll, m, mlen, sk);
-    *smlen = smlen_ll;
-    return rc;
-}
-
-int
-crypto_sign_open(unsigned char *m, size_t *mlen,
-                 const unsigned char *sm, size_t smlen,
-                 const unsigned char *pk) {
-    size_t mlen_ll;
-    int rc = mayo_open(MAYO_PARAMS, m, &mlen_ll, sm, smlen, pk);
-    *mlen = mlen_ll;
-    return rc;
-}
-#endif
 
diff --git a/src/mayo_3/api.h b/src/mayo_3/api.h
index c22bade..47899c1 100644
--- a/src/mayo_3/api.h
+++ b/src/mayo_3/api.h
@@ -15,8 +15,6 @@
 int
 crypto_sign_keypair(unsigned char *pk, unsigned char *sk);
 
-
-#ifndef PQM4
 #define crypto_sign MAYO_NAMESPACE(crypto_sign)
 int
 crypto_sign(unsigned char *sm, size_t *smlen,
@@ -40,18 +38,6 @@ int
 crypto_sign_verify(const unsigned char *sig, size_t siglen,
                    const unsigned char *m, size_t mlen,
                    const unsigned char *pk);
-#else
-#include <stddef.h>
-
-int
-crypto_sign(unsigned char *sm, size_t *smlen,
-            const unsigned char *m, size_t mlen,
-            const unsigned char *sk);
 
-int
-crypto_sign_open(unsigned char *m, size_t *mlen,
-                 const unsigned char *sm, size_t smlen,
-                 const unsigned char *pk);
-#endif
 #endif /* api_h */
 
diff --git a/src/mayo_5/api.c b/src/mayo_5/api.c
index 73bebf2..f2e861e 100644
--- a/src/mayo_5/api.c
+++ b/src/mayo_5/api.c
@@ -14,7 +14,6 @@ crypto_sign_keypair(unsigned char *pk, unsigned char *sk) {
     return mayo_keypair(MAYO_PARAMS, pk, sk);
 }
 
-#ifndef PQM4
 int
 crypto_sign(unsigned char *sm, size_t *smlen,
             const unsigned char *m, size_t mlen,
@@ -44,26 +43,4 @@ crypto_sign_verify(const unsigned char *sig, size_t siglen,
         return -1;
     return mayo_verify(MAYO_PARAMS, m, mlen, sig, pk);
 }
-#else
-int
-crypto_sign(unsigned char *sm, size_t *smlen,
-            const unsigned char *m, size_t mlen,
-            const unsigned char *sk) {
-
-    size_t smlen_ll;
-    int rc = mayo_sign(MAYO_PARAMS, sm, &smlen_ll, m, mlen, sk);
-    *smlen = smlen_ll;
-    return rc;
-}
-
-int
-crypto_sign_open(unsigned char *m, size_t *mlen,
-                 const unsigned char *sm, size_t smlen,
-                 const unsigned char *pk) {
-    size_t mlen_ll;
-    int rc = mayo_open(MAYO_PARAMS, m, &mlen_ll, sm, smlen, pk);
-    *mlen = mlen_ll;
-    return rc;
-}
-#endif
 
diff --git a/src/mayo_5/api.h b/src/mayo_5/api.h
index 5763e36..fa1ebbb 100644
--- a/src/mayo_5/api.h
+++ b/src/mayo_5/api.h
@@ -15,8 +15,6 @@
 int
 crypto_sign_keypair(unsigned char *pk, unsigned char *sk);
 
-
-#ifndef PQM4
 #define crypto_sign MAYO_NAMESPACE(crypto_sign)
 int
 crypto_sign(unsigned char *sm, size_t *smlen,
@@ -40,19 +38,6 @@ int
 crypto_sign_verify(const unsigned char *sig, size_t siglen,
                    const unsigned char *m, size_t mlen,
                    const unsigned char *pk);
-#else
-#include <stddef.h>
-
-int
-crypto_sign(unsigned char *sm, size_t *smlen,
-            const unsigned char *m, size_t mlen,
-            const unsigned char *sk);
-
-int
-crypto_sign_open(unsigned char *m, size_t *mlen,
-                 const unsigned char *sm, size_t smlen,
-                 const unsigned char *pk);
-#endif
 
 #endif /* api_h */