diff --git a/src/mac/carbon/utils.cpp b/src/mac/carbon/utils.cpp
index a3f95679a9..3897dadd57 100644
--- a/src/mac/carbon/utils.cpp
+++ b/src/mac/carbon/utils.cpp
@@ -162,7 +162,7 @@ void wxUsleep(unsigned long milliseconds)
     do 
     {
         YieldToAnyThread() ;
-    } while( clock() - start < milliseconds / CLOCKS_PER_SEC ) ;
+    } while( clock() - start < milliseconds /  1000.0 * CLOCKS_PER_SEC ) ;
 }
 
 void wxSleep(int nSecs)
diff --git a/src/mac/utils.cpp b/src/mac/utils.cpp
index a3f95679a9..3897dadd57 100644
--- a/src/mac/utils.cpp
+++ b/src/mac/utils.cpp
@@ -162,7 +162,7 @@ void wxUsleep(unsigned long milliseconds)
     do 
     {
         YieldToAnyThread() ;
-    } while( clock() - start < milliseconds / CLOCKS_PER_SEC ) ;
+    } while( clock() - start < milliseconds /  1000.0 * CLOCKS_PER_SEC ) ;
 }
 
 void wxSleep(int nSecs)