diff --git a/src/Lib/shapelib/shputils.c b/src/Lib/shapelib/shputils.c
index 2a04f5e3..3e8f065d 100644
--- a/src/Lib/shapelib/shputils.c
+++ b/src/Lib/shapelib/shputils.c
@@ -274,7 +274,7 @@ int main( int argc, char ** argv )
                 if (factor == 0)
                 {
                   if (infactor ==0)
-                  { puts("ERROR: Input unit must be defined before output unit"); exit(); }
+                  { puts("ERROR: Input unit must be defined before output unit"); exit(0); }
                   factor=infactor/outfactor;
                 }
                 printf("Output file coordinate values will be factored by %lg\n",factor);