diff --git a/include/asterisk/compat.h b/include/asterisk/compat.h
index e5147cbde8..c9c99c150c 100644
--- a/include/asterisk/compat.h
+++ b/include/asterisk/compat.h
@@ -224,4 +224,12 @@ float roundf(float x);
 #endif
 #endif
 
+#ifndef INFINITY
+#define INFINITY (1.0/0.0)
+#endif
+
+#ifndef NAN
+#define NAN (0.0/0.0)
+#endif
+
 #endif
diff --git a/res/res_pjsip/include/res_pjsip_private.h b/res/res_pjsip/include/res_pjsip_private.h
index a2d1c6eb46..aee6e3e3ff 100644
--- a/res/res_pjsip/include/res_pjsip_private.h
+++ b/res/res_pjsip/include/res_pjsip_private.h
@@ -9,6 +9,7 @@
 #define RES_PJSIP_PRIVATE_H_
 
 #include "asterisk/module.h"
+#include "asterisk/compat.h"
 
 struct ao2_container;
 struct ast_threadpool_options;