diff --git a/modules/core/src/system.cpp b/modules/core/src/system.cpp
index ceb26d7a0b..2c0038b80e 100644
--- a/modules/core/src/system.cpp
+++ b/modules/core/src/system.cpp
@@ -758,8 +758,7 @@ int64 getTickCount(void)
     return (int64)mach_absolute_time();
 #else
     struct timeval tv;
-    struct timezone tz;
-    gettimeofday( &tv, &tz );
+    gettimeofday(&tv, NULL);
     return (int64)tv.tv_sec*1000000 + tv.tv_usec;
 #endif
 }