diff --git a/Modules/Foundation/GNUmakefile b/Modules/Foundation/GNUmakefile
index dc5338e..47140e6 100644
--- a/Modules/Foundation/GNUmakefile
+++ b/Modules/Foundation/GNUmakefile
@@ -27,6 +27,7 @@ BUNDLE_NAME = Foundation
 Foundation_OBJC_FILES = \
         STFoundationModule.m \
         FoundationConstants.m  \
+        NSString+additions.m \
         NSFileManager+additions.m
         
 Foundation_PRINCIPAL_CLASS = STFoundationModule