diff --git a/sbt b/sbt
index a1e5f6c91..e7697e190 100755
--- a/sbt
+++ b/sbt
@@ -320,7 +320,8 @@ addSbtScriptProperty () {
     :
   else
     sbt_script=$0
-    sbt_script=${sbt_script/ /%20}
+    # Use // to replace all spaces with %20.
+    sbt_script=${sbt_script// /%20}
     addJava "-Dsbt.script=$sbt_script"
   fi
 }