diff --git a/PBGitHistoryController.h b/PBGitHistoryController.h
index 7fdbd64..da846d3 100644
--- a/PBGitHistoryController.h
+++ b/PBGitHistoryController.h
@@ -59,9 +59,9 @@
 - (IBAction) setBranchFilter:(id)sender;
 
 - (void) selectCommit: (NSString*) commit;
-- (IBAction) refresh: sender;
+- (IBAction) refresh:(id)sender;
 - (IBAction) toggleQLPreviewPanel:(id)sender;
-- (IBAction) openSelectedFile: sender;
+- (IBAction) openSelectedFile:(id)sender;
 - (void) updateQuicklookForce: (BOOL) force;
 
 // Context menu methods
diff --git a/PBGitHistoryController.m b/PBGitHistoryController.m
index 133f508..1aeebcc 100644
--- a/PBGitHistoryController.m
+++ b/PBGitHistoryController.m
@@ -261,7 +261,7 @@
 	[super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
 }
 
-- (IBAction) openSelectedFile: sender
+- (IBAction) openSelectedFile:(id)sender
 {
 	NSArray* selectedFiles = [treeController selectedObjects];
 	if ([selectedFiles count] == 0)
@@ -364,7 +364,7 @@
 	}
 }
 
-- (IBAction) refresh: sender
+- (IBAction) refresh:(id)sender
 {
 	[repository forceUpdateRevisions];
 }