diff --git a/configure_build.sh b/configure_build.sh
index 6fe6ff4..1dbf394 100755
--- a/configure_build.sh
+++ b/configure_build.sh
@@ -11,7 +11,7 @@ git submodule init
 git submodule update
 
 cp -r mastodont-c treebird/
-cp treebird/{config.def.h,config.h}
+cp treebird/config.def.h treebird/config.h
 
 ln -s ../treebird/config.h ${CONFIG_DIR}