diff --git a/src/libstrongswan/tests/Makefile.am b/src/libstrongswan/tests/Makefile.am
index 1a2091a66..44d797ef4 100644
--- a/src/libstrongswan/tests/Makefile.am
+++ b/src/libstrongswan/tests/Makefile.am
@@ -18,4 +18,5 @@ test_runner_CFLAGS = \
 test_runner_LDFLAGS = @COVERAGE_LDFLAGS@
 test_runner_LDADD = \
   $(top_builddir)/src/libstrongswan/libstrongswan.la \
+  $(PTHREADLIB) \
   @CHECK_LIBS@