diff --git a/build/jam/MiscRules b/build/jam/MiscRules
index b687926914..7fdf7f075b 100644
--- a/build/jam/MiscRules
+++ b/build/jam/MiscRules
@@ -224,7 +224,7 @@ actions RunCommandLine1 {
 		eval "${target}=${t}"
 	done
 	$(HOST_ADD_BUILD_COMPATIBILITY_LIB_DIR)
-	$(COMMAND_LINE)
+	"$(COMMAND_LINE)"
 }