diff --git a/CMakeLists.txt b/CMakeLists.txt
index 16d2670..4b9588d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -73,7 +73,7 @@ install(TARGETS shum
 )
 
 # Install the Fortran module files
-install(DIRECTORY ${CMAKE_Fortran_MODULE_DIRECTORY}
+install(DIRECTORY ${CMAKE_Fortran_MODULE_DIRECTORY}/
   DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
 
 # Unit tests and framework