diff --git a/src/gtest/Makefile.am b/src/gtest/Makefile.am
index 3824d712075..7defa342d05 100644
--- a/src/gtest/Makefile.am
+++ b/src/gtest/Makefile.am
@@ -19,8 +19,8 @@
 # FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 # IN THE SOFTWARE.
 
-AM_CFLAGS = $(DEFINES) -I$(top_builddir)/src/gtest/include
-AM_CXXFLAGS = $(DEFINES) -I$(top_builddir)/src/gtest/include
+AM_CFLAGS = $(DEFINES) -I$(top_srcdir)/src/gtest/include
+AM_CXXFLAGS = $(DEFINES) -I$(top_srcdir)/src/gtest/include
 
 noinst_LTLIBRARIES = libgtest.la