diff --git a/include/apu_version.h b/include/apu_version.h
index d7362d9..9a11a81 100644
--- a/include/apu_version.h
+++ b/include/apu_version.h
@@ -69,7 +69,7 @@
  *  This symbol is defined for internal, "development" copies of APU. This
  *  symbol will be #undef'd for releases. 
  */
-#define APU_IS_DEV_VERSION
+#undef APU_IS_DEV_VERSION
 
 
 /** The formatted string of APU's version */