diff --git a/tests/libtest/Makefile.am b/tests/libtest/Makefile.am
index 1363add60..e7d3338c0 100644
--- a/tests/libtest/Makefile.am
+++ b/tests/libtest/Makefile.am
@@ -4,7 +4,7 @@
 
 AUTOMAKE_OPTIONS = foreign nostdinc
 
-INCLUDES = -I$(top_srcdir)/include/curl -I$(top_srcdir)/lib
+INCLUDES = -I$(top_srcdir)/include/curl -I$(top_builddir)/lib
 
 LIBDIR = ../../lib