diff --git a/sesman/Makefile.am b/sesman/Makefile.am
index 7edb539a..07fdf43a 100644
--- a/sesman/Makefile.am
+++ b/sesman/Makefile.am
@@ -49,7 +49,8 @@ xrdp_sesman_SOURCES = \
 xrdp_sesman_LDADD = \
   $(top_srcdir)/common/libcommon.la \
   $(top_srcdir)/sesman/libscp/libscp.la \
-  $(AUTH_LIB)
+  $(AUTH_LIB) \
+  -lpthread
 
 sesmansysconfdir=$(sysconfdir)/xrdp
 
diff --git a/sesman/libscp/Makefile.am b/sesman/libscp/Makefile.am
index 27ae1fd0..de8513f8 100644
--- a/sesman/libscp/Makefile.am
+++ b/sesman/libscp/Makefile.am
@@ -27,4 +27,5 @@ libscp_la_SOURCES = \
   libscp_vX.c
 
 libscp_la_LIBADD = \
-  $(top_srcdir)/common/libcommon.la
+  $(top_srcdir)/common/libcommon.la \
+  -lpthread