diff --git a/contrib/blossom/concorde97/INCLUDE/machdefs.h b/contrib/blossom/concorde97/INCLUDE/machdefs.h
index 7612cb3ce47aac1c1ca0a30c4a1e121d4fb7b84e..fe026136a92fb09543c2e6d6c9f63ac84e5a96d5 100644
--- a/contrib/blossom/concorde97/INCLUDE/machdefs.h
+++ b/contrib/blossom/concorde97/INCLUDE/machdefs.h
@@ -17,7 +17,7 @@
 #include <unistd.h>
 #include <assert.h>
 #include <time.h>
-#define CC_ZEIT_TIMES
+#undef CC_ZEIT_TIMES
 #endif
 
 #ifdef  CCSYS_STANDARD_KNR