diff --git a/src/SMESH_I/Makefile.am b/src/SMESH_I/Makefile.am
index 6a8e25174..a3c28ccd5 100644
--- a/src/SMESH_I/Makefile.am
+++ b/src/SMESH_I/Makefile.am
@@ -86,6 +86,7 @@ libSMESHEngine_la_CPPFLAGS = \
 	@HDF5_INCLUDES@ \
 	$(BOOST_CPPFLAGS) \
 	$(KERNEL_CXXFLAGS) \
+	$(GUI_CXXFLAGS) \
 	$(MED_CXXFLAGS) \
 	$(GEOM_CXXFLAGS) \
 	-I$(srcdir)/../Controls \
diff --git a/src/StdMeshers/Makefile.am b/src/StdMeshers/Makefile.am
index d05ea4dbb..64b2af933 100644
--- a/src/StdMeshers/Makefile.am
+++ b/src/StdMeshers/Makefile.am
@@ -110,6 +110,7 @@ libStdMeshers_la_CPPFLAGS = \
 	$(CAS_CPPFLAGS) \
 	$(BOOST_CPPFLAGS) \
 	$(KERNEL_CXXFLAGS) \
+	$(GUI_CXXFLAGS) \
 	-I$(srcdir)/../SMESHImpl \
 	-I$(srcdir)/../MEFISTO2 \
 	-I$(srcdir)/../SMESH \