diff --git a/m3-libs/m3core/src/coroutine/UCONTEXT/ContextC.c b/m3-libs/m3core/src/coroutine/UCONTEXT/ContextC.c
index ae5dd7d17e..18f71750f4 100644
--- a/m3-libs/m3core/src/coroutine/UCONTEXT/ContextC.c
+++ b/m3-libs/m3core/src/coroutine/UCONTEXT/ContextC.c
@@ -16,6 +16,7 @@
 #include <errno.h>
 #include <stdio.h>
 #include <string.h>
+#include <signal.h>
 #include <assert.h>
 
 #define M3_RETRY(expr)                                  \