diff --git a/docker_compose.py b/docker_compose.py
index cfe9301..1fab5c6 100644
--- a/docker_compose.py
+++ b/docker_compose.py
@@ -129,7 +129,7 @@ def args_setup(description):
 	parser.add_argument("compose_files", nargs="+")
 	parser.add_argument("--output", "-o")
 	parser.add_argument("--ignore", "-i", nargs="+", default=False)
-	parser.add_argument("--match-suffix", "-s", action="store_false")
+	parser.add_argument("--match-suffix", "-s", action="store_true")
 	return parser
 
 if __name__ == "__main__":
diff --git a/image_tags.py b/image_tags.py
index 099ff22..56ca368 100644
--- a/image_tags.py
+++ b/image_tags.py
@@ -45,7 +45,7 @@ def replace(string, replacements):
 
 
 def compare(base, other, match_suffix=False, replacements=[("-","+"),]):
-	if match_suffix:
+	if match_suffix and "-" in base:
 		suffix = base.split("-")[-1]
 		if not other.endswith(suffix):
 			return False
diff --git a/show_updateable.py b/show_updateable.py
index 278e3cc..7a9e0f6 100644
--- a/show_updateable.py
+++ b/show_updateable.py
@@ -31,16 +31,16 @@ def main(args):
 				if not "base_images" in usage:
 					continue
 				for base in usage["base_images"]:
-					info = [{
+					info = {
 						"is_base_image": True,
 						"path": usage["path"],
 						"service_name": usage["service_name"]
-					}]
+					}
 					if base in updates:
 						updates[base]["usages"].append(info)
 					else:
 						log.info(f"find base image updates for {base}")
-						updates[base] = find_updates(base, info, args.match_suffix)
+						updates[base] = find_updates(base, [info], args.match_suffix)
 				
 	if args.output:
 		with open(args.output, "w") as out: