diff --git a/keyword_space.sed b/keyword_space.sed
index 39a43c7765..0be480408a 100644
--- a/keyword_space.sed
+++ b/keyword_space.sed
@@ -1,7 +1,7 @@
-s/if(/if (/
-s/switch(/switch (/
-s/case(/case (/
-s/while(/while (/
-s/for(/for (/
-s/do(/do (/
+s/\bif(/if (/
+s/\bswitch(/switch (/
+s/\bcase(/case (/
+s/\bwhile(/while (/
+s/\bfor(/for (/
+s/\bdo(/do (/
 s/! /!/