diff --git a/build.sh b/build.sh
index 6844ea6..1569737 100755
--- a/build.sh
+++ b/build.sh
@@ -79,7 +79,7 @@ MSYS_NT*|MINGW*) # MSYS2 on Windows
 	fi
 	;;
 Darwin) # macOS
-	CFLAGS="${CFLAGS} -Wno-typedef-redefinition"
+	CFLAGS="${CFLAGS} -Wno-typedef-redefinition -D_C99_SOURCE"
 	UXNEMU_LDFLAGS="$(brew --prefix)/lib/libSDL2.a $(sdl2-config --cflags --static-libs | sed -e 's/-lSDL2 //')"
 	;;
 Linux|*)
diff --git a/src/devices/file.c b/src/devices/file.c
index bc7c4fd..a208b8f 100644
--- a/src/devices/file.c
+++ b/src/devices/file.c
@@ -26,10 +26,6 @@
 #define PATH_MAX 4096
 #endif
 
-#ifdef __APPLE__
-int snprintf(char *, unsigned long, const char *, ...);
-#endif
-
 #include "../uxn.h"
 #include "file.h"