diff --git a/src/kits/shared/Json.cpp b/src/kits/shared/Json.cpp
index a80335006a..188e3a4d2f 100644
--- a/src/kits/shared/Json.cpp
+++ b/src/kits/shared/Json.cpp
@@ -43,7 +43,7 @@ public:
 			error = fError.String();
 		else
 			error = strerror(fReturnCode);
-		printf("Parse error at %ld: %s\n", fPosition, error);
+		printf("Parse error at %" B_PRIi32 ": %s\n", fPosition, error);
 	}
 	
 	status_t ReturnCode() const