diff --git a/opal/util/Makefile.am b/opal/util/Makefile.am
index d4d87a35f7..e953034688 100644
--- a/opal/util/Makefile.am
+++ b/opal/util/Makefile.am
@@ -27,6 +27,8 @@ LEX_OUTPUT_ROOT = lex.opal_show_help_yy
 
 noinst_LTLIBRARIES = libopalutil.la
 
+AM_CPPFLAGS = $(LTDLINCL)
+
 # Source code files
 
 headers = \