diff --git a/tools/check-coverage.awk b/tools/check-coverage.awk
index 2fdbb12..1d3617e 100755
--- a/tools/check-coverage.awk
+++ b/tools/check-coverage.awk
@@ -100,6 +100,7 @@ function character_set_common(charset, filename, pattern,   line, j, k, ks, n, c
 	close(filename);
 	for(j = 1; j <= fontno; j += 1) {
 		n = 0;
+		missing = 0;
 		for(k in T) {
 			ks = sprintf("%8d", k + 0)
 			#print "["ks","j"]", (ks SUBSEP j in exist)
@@ -108,7 +109,9 @@ function character_set_common(charset, filename, pattern,   line, j, k, ks, n, c
 				n = n + 1;
 			} else {
 				#printf("(%X)", k);
-				missing = k;
+				if(!missing) {
+					missing = k;
+				}
 			}
 		}
 		printf("%s", display_coverage_font(n, assigned));