diff --git a/test/Makefile.in b/test/Makefile.in
index 357f3c83..7397fce1 100644
--- a/test/Makefile.in
+++ b/test/Makefile.in
@@ -5,7 +5,7 @@ srcdir   := @srcdir@
 VPATH    := @srcdir@
 
 CXX      := @CXX@
-CXXFLAGS := @CPPFLAGS@ @CXXFLAGS@ -I../include
+CXXFLAGS := -I$(srcdir)/../include -I../include @CPPFLAGS@ @CXXFLAGS@
 LDFLAGS  := @LDFLAGS@
 LIBS     := @LIBS@