diff --git a/dfhack/python/DF_Constructions.cpp b/dfhack/python/DF_Constructions.cpp
index f4d4a8328..237efb479 100644
--- a/dfhack/python/DF_Constructions.cpp
+++ b/dfhack/python/DF_Constructions.cpp
@@ -22,8 +22,8 @@ must not be misrepresented as being the original software.
 distribution.
 */
 
-#ifndef __DFConstructionS__
-#define __DFConstructionS__
+#ifndef __DFCONSTRUCTIONS__
+#define __DFCONSTRUCTIONS__
 
 #include "Python.h"
 #include "modules/Constructions.h"