diff --git a/alib2algo/src/graph/isomorphism/HopcroftDebug.h b/alib2algo/src/graph/isomorphism/HopcroftDebug.h
index 0863c9ace7af2e6d1ef6297f100e99683fbb31e5..fda46e7eb91ebf3e2300fb6b9f916bb427186f13 100644
--- a/alib2algo/src/graph/isomorphism/HopcroftDebug.h
+++ b/alib2algo/src/graph/isomorphism/HopcroftDebug.h
@@ -7,7 +7,7 @@
 #define H_DEBUG(x) std::cout << std::boolalpha << x << std::endl
 #else
 #define H_ASSERT(x)
-#define HOPCROFT_DEBUG(str)
+#define H_DEBUG(str)
 #endif
 
 #endif // GRAPH_HOPCROFT_DEBUG_H_