diff --git a/src/Instrumentation/Makefile.am b/src/Instrumentation/Makefile.am
index 1a1892023..aa3f1be07 100644
--- a/src/Instrumentation/Makefile.am
+++ b/src/Instrumentation/Makefile.am
@@ -30,4 +30,4 @@ libInstrumentation_a_SOURCES = \
 	dclgps.cxx dclgps.hxx \
 	render_area_2d.cxx render_area_2d.hxx	
 
-INCLUDES = -I$(top_srcdir) -I$(top_srcdir)/src
+INCLUDES = -I$(top_srcdir) -I$(top_srcdir)/src -I$(top_builddir)/src