diff --git a/src/tool_cfgable.h b/src/tool_cfgable.h
index 89243ef254..329691ec3b 100644
--- a/src/tool_cfgable.h
+++ b/src/tool_cfgable.h
@@ -29,15 +29,6 @@
 #include "tool_urlglob.h"
 #include "var.h"
 
-/* the type we use for storing a single boolean bit */
-#ifndef BIT
-#ifdef _MSC_VER
-#define BIT(x) bool x
-#else
-#define BIT(x) unsigned int x:1
-#endif
-#endif
-
 #define MAX_CONFIG_LINE_LENGTH (10 * 1024 * 1024)
 
 #define checkprefix(a, b) curl_strnequal(b, STRCONST(a))