diff --git a/src/crypto/sha1-internal.c b/src/crypto/sha1-internal.c
index 51e612136..3f05ca113 100644
--- a/src/crypto/sha1-internal.c
+++ b/src/crypto/sha1-internal.c
@@ -183,8 +183,8 @@ void SHA1Transform(u32 state[5], const unsigned char buffer[64])
 	} CHAR64LONG16;
 	CHAR64LONG16* block;
 #ifdef SHA1HANDSOFF
-	u32 workspace[16];
-	block = (CHAR64LONG16 *) workspace;
+	CHAR64LONG16 workspace;
+	block = &workspace;
 	os_memcpy(block, buffer, 64);
 #else
 	block = (CHAR64LONG16 *) buffer;