diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index ec6e318e8631fdd8a8a43bafa4b4ff0b2aa44351..45920a999c9c68c89fe30fe093c15073124c6691 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -63,7 +63,7 @@ if ("${BUILD_LIB}" STREQUAL "yes")
             NormalizationStrategy/NormalizationStrategy.cpp
             LearningMethods/GradientDescentSingleItem.cpp
             LearningMethods/LearningSequence.cpp
-            LearningMethods/GradientDescentBB.cpp6
+            LearningMethods/GradientDescentBB.cpp
     )
 
     # FileSystem C++ library - has to be linked manually in GCC-8