diff --git a/src/bin/isvolume.cpp b/src/bin/isvolume.cpp
index 489206ff9a..f8b2ef014d 100644
--- a/src/bin/isvolume.cpp
+++ b/src/bin/isvolume.cpp
@@ -34,7 +34,7 @@ usage()
 
 
 int
-main(int32 argc, char** argv)
+main(int argc, char** argv)
 {
 	dev_t volumeDevice = dev_for_path(".");
 	uint32 isVolumeFlags = 0;