diff --git a/libcc1/libcc1plugin.cc b/libcc1/libcc1plugin.cc
index 12ab5a5..a2762e7 100644
--- a/libcc1/libcc1plugin.cc
+++ b/libcc1/libcc1plugin.cc
@@ -31,6 +31,8 @@
 #undef PACKAGE_TARNAME
 #undef PACKAGE_VERSION
 
+#include <pthread.h>
+
 #include "gcc-plugin.h"
 #include "system.h"
 #include "coretypes.h"
diff --git a/libcc1/libcp1plugin.cc b/libcc1/libcp1plugin.cc
index 83dab7f..d84fa64 100644
--- a/libcc1/libcp1plugin.cc
+++ b/libcc1/libcp1plugin.cc
@@ -32,6 +32,8 @@
 #undef PACKAGE_TARNAME
 #undef PACKAGE_VERSION
 
+#include <pthread.h>
+
 #include "gcc-plugin.h"
 #include "system.h"
 #include "coretypes.h"