diff --git a/src/SHA1.c b/src/SHA1.c
index 3ef07d920..f9ac19da3 100644
--- a/src/SHA1.c
+++ b/src/SHA1.c
@@ -53,7 +53,7 @@ int SHA1_Final(unsigned char *md, SHA_CTX *c)
 }
 
 #else /* if defined(_WIN32) || defined(_WIN64) */
-#if defined(__linux__) || defined(__CYGWIN__)
+#if defined(__linux__) || defined(__CYGWIN__) || defined(__GNU__)
 #  include <endian.h>
 #elif defined(__APPLE__)
 #  include <libkern/OSByteOrder.h>