diff --git a/Algorithms/IteratorBasedCRC32.h b/Algorithms/IteratorBasedCRC32.h
index e4a6dc6ec..9c2e5ebbc 100644
--- a/Algorithms/IteratorBasedCRC32.h
+++ b/Algorithms/IteratorBasedCRC32.h
@@ -98,7 +98,7 @@ private:
     }
 
     inline unsigned cpuid() const {
-        unsigned eax, ebx, ecx, edx;
+        unsigned eax = 0, ebx = 0, ecx = 0, edx = 0;
         // on X64 this calls hardware cpuid(.) instr. otherwise a dummy impl.
         __get_cpuid( 1, &eax,  &ebx, &ecx, &edx );
         return ecx;