diff --git a/test/Makefile.am b/test/Makefile.am
index 1a89e560..b35f6110 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -3,7 +3,7 @@ CFLAGS_O0 = $(CFLAGS_BASE) -O0
 CFLAGS_O1 = $(CFLAGS_BASE) -O1
 CFLAGS_O2 = $(CFLAGS_BASE) -O2
 CFLAGS_O3 = $(CFLAGS_BASE) -O3
-DEFAULT_INCLUDES = -I..
+DEFAULT_INCLUDES = -I.. -I/usr/local/include
 
 CFLAGS = $(CFLAGS_BASE)