diff --git a/src/H5Part.c b/src/H5Part.c
index 0cb8763..f7e52d3 100644
--- a/src/H5Part.c
+++ b/src/H5Part.c
@@ -2088,7 +2088,7 @@ H5PartReadParticleStep (
 
 h5part_int64_t
 H5PartSetVerbosityLevel (
-	unsigned int level
+	h5part_int64_t level
 	) {
 
 	_debug = level;