2 files changed, 2 insertions, 2 deletions
diff --git a/common.h b/common.h
index 26e4b61..2d2eb79 100644
--- a/common.h
+++ b/common.h
@@ -389,7 +389,7 @@ void markfileonce(int id, const char *guard);
 void markfileseen(int id);
 bool isfileseen(int id);
 void closefile(int id);
-void fatal(const struct span *, const char *, ...);
+_Noreturn void fatal(const struct span *, const char *, ...);
 void error(const struct span *, const char *, ...);
 void warn(const struct span *, const char *, ...);
 void note(const struct span *, const char *, ...);
diff --git a/io.c b/io.c
index 348b42e..ab3499b 100644
--- a/io.c
+++ b/io.c
@@ -1042,7 +1042,7 @@ vdiag(const struct span *span, enum diagkind kind, const char *fmt, va_list ap)
          note(&(struct span){ span->sl }, "expanded from here");
 }
 
-void
+void _Noreturn
 fatal(const struct span *span, const char *fmt, ...)
 {
    va_list ap;