diff --git a/include/apu_version.h b/include/apu_version.h
index 2fd2b06..a212515 100644
--- a/include/apu_version.h
+++ b/include/apu_version.h
@@ -66,7 +66,7 @@
  * "development" copies of APU.  It is undefined for released versions
  * of APU.
  */
-#define APU_IS_DEV_VERSION
+#undef APU_IS_DEV_VERSION
 
 
 #if defined(APU_IS_DEV_VERSION) || defined(DOXYGEN)