diff --git a/Makefile.am b/Makefile.am
index 75d62f061..71fc9113c 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -823,7 +823,8 @@ nodist_libsystemd_shared_la_SOURCES = \
 
 libsystemd_shared_la_CFLAGS = \
 	$(AM_CFLAGS) \
-	$(SECCOMP_CFLAGS)
+	$(SECCOMP_CFLAGS) \
+	-pthread
 
 # ------------------------------------------------------------------------------
 noinst_LTLIBRARIES += \