diff --git a/posix.mak b/posix.mak
index 034e1e03c4..aef972de57 100644
--- a/posix.mak
+++ b/posix.mak
@@ -121,7 +121,7 @@ endif
 
 test_rdmd: $(ROOT)/rdmd_test $(RDMD_TEST_EXECUTABLE)
 	$< $(RDMD_TEST_EXECUTABLE) -m$(MODEL) \
-	   --rdmd-default-compiler=$(RDMD_TEST_DEFAULT_COMPILER) \
+	   --default-compiler=$(RDMD_TEST_DEFAULT_COMPILER) \
 	   --test-compilers=$(RDMD_TEST_COMPILERS) \
 	   $(VERBOSE_RDMD_TEST_FLAGS)
 	$(DMD) $(DFLAGS) -unittest -main -run rdmd.d
diff --git a/rdmd_test.d b/rdmd_test.d
index c19d430921..982cf6e170 100755
--- a/rdmd_test.d
+++ b/rdmd_test.d
@@ -55,7 +55,7 @@ int main(string[] args)
     string testCompilerList; // e.g. "ldmd2,gdmd" (comma-separated list of compiler names)
 
     auto helpInfo = getopt(args,
-        "rdmd-default-compiler", "[REQUIRED] default D compiler used by rdmd executable", &defaultCompiler,
+        "D|default-compiler", "[REQUIRED] default D compiler used by rdmd executable", &defaultCompiler,
         "concurrency", "whether to perform the concurrency test cases", &concurrencyTest,
         "m|model", "architecture to run the tests for [32 or 64]", &model,
         "test-compilers", "comma-separated list of D compilers to test with rdmd", &testCompilerList,
diff --git a/win32.mak b/win32.mak
index 7efb41c931..58531182f2 100644
--- a/win32.mak
+++ b/win32.mak
@@ -102,7 +102,7 @@ $(ROOT)\rdmd_test.exe : rdmd_test.d
 test_rdmd : $(ROOT)\rdmd_test.exe $(RDMD_TEST_EXECUTABLE)
         $(ROOT)\rdmd_test.exe \
            $(RDMD_TEST_EXECUTABLE) -m$(MODEL) -v \
-           --rdmd-default-compiler=$(RDMD_TEST_DEFAULT_COMPILER) \
+           --default-compiler=$(RDMD_TEST_DEFAULT_COMPILER) \
            --test-compilers=$(RDMD_TEST_COMPILERS)
 
 test : test_rdmd