diff --git a/src/core/ActionWithArguments.cpp b/src/core/ActionWithArguments.cpp
index e5a90d8cc60fba1b975bbb017aa9b7a4b3f224d7..3531785f87a66cd550a8f279e3b80f2b929be973 100644
--- a/src/core/ActionWithArguments.cpp
+++ b/src/core/ActionWithArguments.cpp
@@ -21,7 +21,7 @@
 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ */
 #include "ActionWithArguments.h"
 #include "ActionWithValue.h"
-#include "tools/Pdb.h"
+#include "tools/PDB.h"
 #include "PlumedMain.h"
 #include "ActionSet.h"