diff --git a/src/crypto/crc.cpp b/src/crypto/crc.cpp
index 3b95455..2a2b026 100644
--- a/src/crypto/crc.cpp
+++ b/src/crypto/crc.cpp
@@ -615,6 +615,8 @@ uint64_t _mm_crc32_u64(uint64_t a, uint64_t b )
 
 int main( int argc, char** argv )
 {
+    // Squelch warning about unusued variable crc_c
+    (void)(crc_c);
     uint64_t f = 0x1234;
     uint64_t a = 0x5678;
     uint32_t f1 = _mm_crc32_u64(f, a);