diff --git a/include/color.h b/include/color.h
index a22a00c2..e30f28c5 100644
--- a/include/color.h
+++ b/include/color.h
@@ -21,7 +21,7 @@ enum color_opt {
 };
 
 void enable_color(void);
-int check_enable_color(int color, int json);
+bool check_enable_color(int color, int json);
 bool matches_color(const char *arg, int *val);
 void set_color_palette(void);
 int color_fprintf(FILE *fp, enum color_attr attr, const char *fmt, ...);
diff --git a/lib/color.c b/lib/color.c
index 9c902358..eaf69e74 100644
--- a/lib/color.c
+++ b/lib/color.c
@@ -79,16 +79,16 @@ void enable_color(void)
 	set_color_palette();
 }
 
-int check_enable_color(int color, int json)
+bool check_enable_color(int color, int json)
 {
 	if (json || color == COLOR_OPT_NEVER)
-		return 1;
+		return false;
 
 	if (color == COLOR_OPT_ALWAYS || isatty(fileno(stdout))) {
 		enable_color();
-		return 0;
+		return true;
 	}
-	return 1;
+	return false;
 }
 
 bool matches_color(const char *arg, int *val)