diff --git a/res/res_musiconhold.c b/res/res_musiconhold.c
index d01e87e244..82e0534786 100644
--- a/res/res_musiconhold.c
+++ b/res/res_musiconhold.c
@@ -43,6 +43,10 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
 #include <dirent.h>
 #include <sys/ioctl.h>
 
+#ifdef SOLARIS
+#include <thread.h>
+#endif
+
 #ifdef HAVE_DAHDI
 #include <dahdi/user.h>
 #endif