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-rw-r--r--src/engine/machina/Mutation.hpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/engine/machina/Mutation.hpp b/src/engine/machina/Mutation.hpp
index 6d97d29..eca3e37 100644
--- a/src/engine/machina/Mutation.hpp
+++ b/src/engine/machina/Mutation.hpp
@@ -20,7 +20,7 @@
#include "config.h"
-#if HAVE_EUGENE
+#ifdef HAVE_EUGENE
#include "eugene/Mutation.hpp"
#define SUPER : public Eugene::Mutation<Machine>
#else