diff --git a/Makefile.am b/Makefile.am
index 429554e1..4919202e 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -235,7 +235,7 @@ check_LTLIBRARIES += src/libespeak-ng-test.la
 
 src_libespeak_ng_test_la_LDFLAGS = $(src_libespeak_ng_la_LDFLAGS)
 src_libespeak_ng_test_la_CFLAGS  = \
-	-fPIC -pedantic -fno-exceptions -D PATH_ESPEAK_DATA=\"$(DATADIR)\" -DLIBESPEAK_NG_EXPORT \
+	-fPIC -pedantic -fno-exceptions -DPATH_ESPEAK_DATA=\"$(DATADIR)\" -DLIBESPEAK_NG_EXPORT \
 	${PCAUDIOLIB_CFLAGS} ${AM_CFLAGS}
 src_libespeak_ng_test_la_SOURCES = $(src_libespeak_ng_la_SOURCES)