diff --git a/src/OpenMesh/Apps/Decimating/DecimaterGui/CMakeLists.txt b/src/OpenMesh/Apps/Decimating/DecimaterGui/CMakeLists.txt
index 79dfb15c..46c8505e 100644
--- a/src/OpenMesh/Apps/Decimating/DecimaterGui/CMakeLists.txt
+++ b/src/OpenMesh/Apps/Decimating/DecimaterGui/CMakeLists.txt
@@ -5,6 +5,7 @@ include_directories (
   ${CMAKE_CURRENT_SOURCE_DIR}
   ${GLEW_INCLUDE_DIR}
   ${GLUT_INCLUDE_DIR}
+  ${QT_INCLUDE_DIR}
 )
 
 set (targetName DecimaterGui)
diff --git a/src/OpenMesh/Apps/QtViewer/CMakeLists.txt b/src/OpenMesh/Apps/QtViewer/CMakeLists.txt
index f49b50f6..5c66ee0d 100644
--- a/src/OpenMesh/Apps/QtViewer/CMakeLists.txt
+++ b/src/OpenMesh/Apps/QtViewer/CMakeLists.txt
@@ -5,6 +5,7 @@ include_directories (
   ${CMAKE_CURRENT_SOURCE_DIR}
   ${GLEW_INCLUDE_DIR}
   ${GLUT_INCLUDE_DIR}
+  ${QT_INCLUDE_DIR}
 )
 
 set (targetName QtViewer)
diff --git a/src/OpenMesh/Apps/Subdivider/SubdividerGui/CMakeLists.txt b/src/OpenMesh/Apps/Subdivider/SubdividerGui/CMakeLists.txt
index a9df3696..0302c5f8 100644
--- a/src/OpenMesh/Apps/Subdivider/SubdividerGui/CMakeLists.txt
+++ b/src/OpenMesh/Apps/Subdivider/SubdividerGui/CMakeLists.txt
@@ -5,6 +5,7 @@ include_directories (
   ${CMAKE_CURRENT_SOURCE_DIR}
   ${GLEW_INCLUDE_DIR}
   ${GLUT_INCLUDE_DIR}
+  ${QT_INCLUDE_DIR}
 )
 
 set (targetName SubdividerGui)