diff --git a/src/prototypes.h b/src/prototypes.h
index 61ae7c2f..c6bd6b87 100644
--- a/src/prototypes.h
+++ b/src/prototypes.h
@@ -413,7 +413,7 @@ RETSIGTYPE handle_crash(int signal);
 #endif
 RETSIGTYPE do_suspend(int signal);
 RETSIGTYPE do_continue(int signal);
-#if !defined(NANO_TINY) || defined(ENABLE_SPELLER)
+#if !defined(NANO_TINY) || defined(ENABLE_SPELLER) || defined(ENABLE_COLOR)
 void block_sigwinch(bool blockit);
 #endif
 #ifndef NANO_TINY