diff --git a/common/processor/mac/Processor.cpp b/common/processor/mac/Processor.cpp
index 7836fb3..59f06e2 100644
--- a/common/processor/mac/Processor.cpp
+++ b/common/processor/mac/Processor.cpp
@@ -24,7 +24,7 @@ uint32_t OsGetProcessorFeaturesEx(int32_t& vendorID) {
         features = 0x80000000;
 
         int32_t feature;
-        int32_t length;
+        size_t length;
 
         length = sizeof(feature);
         if (sysctlbyname("hw.optional.mmx", &feature, &length, nullptr, 0) == 0 && feature) {
@@ -55,4 +55,4 @@ uint64_t OsGetProcessorTicksPerSecond() {
     return 1000ULL;
 }
 
-#endif
\ No newline at end of file
+#endif