diff --git a/src/DriverSTL/Makefile.am b/src/DriverSTL/Makefile.am
index 82962d143..770a7f1a5 100644
--- a/src/DriverSTL/Makefile.am
+++ b/src/DriverSTL/Makefile.am
@@ -54,6 +54,7 @@ libMeshDriverSTL_la_CPPFLAGS = \
 	$(BOOST_CPPFLAGS) \
 	-I$(srcdir)/../Driver \
 	-I$(srcdir)/../SMESH \
+	-I$(srcdir)/../SMESHUtils \
 	-I$(srcdir)/../SMDS
 
 libMeshDriverSTL_la_LDFLAGS  = \