diff --git a/src/Kaleidoscope/Syster.cpp b/src/Kaleidoscope/Syster.cpp
index f729bc25..d511fb41 100644
--- a/src/Kaleidoscope/Syster.cpp
+++ b/src/Kaleidoscope/Syster.cpp
@@ -18,7 +18,7 @@
 
 #include <Kaleidoscope-Syster.h>
 
-using KaleidoscopePlugins::Ranges;
+using namespace KaleidoscopePlugins::Ranges;
 
 namespace KaleidoscopePlugins {
 // --- state ---