diff --git a/Models/PGNode.m b/Models/PGNode.m
index 0b24b4f..53af202 100644
--- a/Models/PGNode.m
+++ b/Models/PGNode.m
@@ -75,7 +75,7 @@ + (NSArray *)pasteboardTypes
 
 + (void)initialize
 {
-	srandom(time(NULL)); // Used by our shuffle sort.
+	srandom((unsigned)time(NULL)); // Used by our shuffle sort.
 }
 
 #pragma mark -PGNode