diff --git a/libfreefare/freefare_internal.h b/libfreefare/freefare_internal.h
index b792ced..f7f8568 100644
--- a/libfreefare/freefare_internal.h
+++ b/libfreefare/freefare_internal.h
@@ -49,14 +49,14 @@
 #  define be16toh(x) betoh16(x)
 #endif
 
-#if !defined(le32toh) && defined(CFSwapInt32LittleToHost)
+#if !defined(le32toh) && defined(HAVE_COREFOUNDATION_COREFOUNDATION_H)
 #  define be32toh(x) CFSwapInt32BigToHost(x)
 #  define htobe32(x) CFSwapInt32HostToBig(x)
 #  define le32toh(x) CFSwapInt32LittleToHost(x)
 #  define htole32(x) CFSwapInt32HostToLittle(x)
 #endif
 
-#if !defined(le16toh) && defined(CFSwapInt16LittleToHost)
+#if !defined(le16toh) && defined(HAVE_COREFOUNDATION_COREFOUNDATION_H)
 #  define be16toh(x) CFSwapInt16BigToHost(x)
 #  define htobe16(x) CFSwapInt16HostToBig(x)
 #  define le16toh(x) CFSwapInt16LittleToHost(x)