diff --git a/slre.c b/slre.c
index 9ac96a3..643dae1 100644
--- a/slre.c
+++ b/slre.c
@@ -167,8 +167,8 @@ static int match_set(const char *re, int re_len, const char *s,
     if (re[len] != '-' && re[len + 1] == '-' && re[len + 2] != ']' &&
         re[len + 2] != '\0') {
       result = info->flags &&  SLRE_IGNORE_CASE ?
-        *s >= re[len] && *s <= re[len + 2] :
-        tolower(*s) >= tolower(re[len]) && tolower(*s) <= tolower(re[len + 2]);
+        tolower(*s) >= tolower(re[len]) && tolower(*s) <= tolower(re[len + 2]) :
+        *s >= re[len] && *s <= re[len + 2];
       len += 3;
     } else {
       result = match_op((unsigned char *) re + len, (unsigned char *) s, info);
diff --git a/unit_test.c b/unit_test.c
index c12d59d..077aeb3 100644
--- a/unit_test.c
+++ b/unit_test.c
@@ -213,6 +213,14 @@ int main(void) {
   ASSERT(slre_match( "a+$" ,"Xaa", 3, NULL, 0, 0) == 3);
   ASSERT(slre_match( "a*$" ,"Xaa", 3, NULL, 0, 0) == 3);
 
+  /* Ignore case flag */
+  ASSERT(slre_match("[a-h]+", "abcdefghxxx", 11, NULL, 0, 0) == 8);
+  ASSERT(slre_match("[A-H]+", "ABCDEFGHyyy", 11, NULL, 0, 0) == 8);
+  ASSERT(slre_match("[a-h]+", "ABCDEFGHyyy", 11, NULL, 0, 0) == SLRE_NO_MATCH);
+  ASSERT(slre_match("[A-H]+", "abcdefghyyy", 11, NULL, 0, 0) == SLRE_NO_MATCH);
+  ASSERT(slre_match("[a-h]+", "ABCDEFGHyyy", 11, NULL, 0, SLRE_IGNORE_CASE) == 8);
+  ASSERT(slre_match("[A-H]+", "abcdefghyyy", 11, NULL, 0, SLRE_IGNORE_CASE) == 8);
+
   {
     /* Example: HTTP request */
     const char *request = " GET /index.html HTTP/1.0\r\n\r\n";