diff --git a/src/EmuFs.cc b/src/EmuFs.cc
index 99e0a684b90..d2ba392e5c7 100644
--- a/src/EmuFs.cc
+++ b/src/EmuFs.cc
@@ -10,6 +10,13 @@
 #include <sstream>
 #include <string>
 
+// muslc defines those, but we want a typedef instead
+#if defined(loff_t)
+typedef loff_t __musl_loff_t;
+#undef loff_t
+typedef __musl_loff_t loff_t;
+#endif
+
 #include "AddressSpace.h"
 #include "ReplaySession.h"
 #include "core.h"
diff --git a/src/ScopedFd.h b/src/ScopedFd.h
index 4a02fdd23c6..377488f9c1a 100644
--- a/src/ScopedFd.h
+++ b/src/ScopedFd.h
@@ -3,6 +3,9 @@
 #ifndef RR_SCOPED_FD_H_
 #define RR_SCOPED_FD_H_
 
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
 #include <fcntl.h>
 #include <sys/stat.h>
 #include <sys/types.h>
diff --git a/src/record_syscall.cc b/src/record_syscall.cc
index 9f757286baa..3bc6bdfeb42 100644
--- a/src/record_syscall.cc
+++ b/src/record_syscall.cc
@@ -102,6 +102,13 @@
 #include "log.h"
 #include "util.h"
 
+// muslc defines those, but we want a typedef instead
+#if defined(loff_t)
+typedef loff_t __musl_loff_t;
+#undef loff_t
+typedef __musl_loff_t loff_t;
+#endif
+
 using namespace std;
 
 #ifndef HAVE_TERMIOS2