diff --git a/configure.ac b/configure.ac
index 935af821..ed232524 100644
--- a/configure.ac
+++ b/configure.ac
@@ -211,7 +211,7 @@ AC_SUBST(AM_CFLAGS)
 AC_SUBST(AM_CPPFLAGS)
 
 ### Checks for library functions.
-AC_FUNC_MALLOC
+AS_IF([test "x$PLATFORM" != xosx], [AC_FUNC_MALLOC])
 AC_CHECK_FUNCS([atexit memset strdup strstr])
 
 AC_CONFIG_FILES([Makefile])