diff --git a/libexec/rbenv-help b/libexec/rbenv-help
index 6dd6fd6e..f15e83fd 100755
--- a/libexec/rbenv-help
+++ b/libexec/rbenv-help
@@ -64,8 +64,8 @@ collect_documentation() {
     }
 
     function trim(str) {
-      gsub(/^\n*/, "", str)
-      gsub(/\n*$/, "", str)
+      sub(/^\n*/, "", str)
+      sub(/\n*$/, "", str)
       return str
     }