diff --git a/tests/Makefile.am b/tests/Makefile.am
index 2bc8f82..c71cd99 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -1,4 +1,4 @@
-DEFS = @DEFS@ -DDATADIR=\"$(top_srcdir)/data\" -DSRCDIR=\"$(srcdir)\" -DPSL_FILE=\"$(PSL_FILE)\" -DPSL_TESTFILE=\"$(PSL_TESTFILE)\"
+DEFS = @DEFS@ -DSRCDIR=\"$(srcdir)\" -DPSL_FILE=\"$(PSL_FILE)\" -DPSL_TESTFILE=\"$(PSL_TESTFILE)\"
 AM_CPPFLAGS = -I$(top_srcdir)/include
 LDADD = ../src/libpsl.la