diff --git a/src/chmode.c b/src/chmode.c
index f0ec84b..373a20e 100644
--- a/src/chmode.c
+++ b/src/chmode.c
@@ -152,8 +152,8 @@ construct_cflag_param_string(void)
 			ConfigChannel.use_except ? "e" : "",
 			ConfigChannel.use_forward ? "f" : "",
 			ConfigChannel.use_halfop ? "h" : "",
-			strcasecmp(ConfigChannel.disabledmodes, "j") ? "" : "j",
-			strcasecmp(ConfigChannel.disabledmodes, "q") ? "" : "q",
+			strchr(ConfigChannel.disabledmodes, "j") ? "" : "j",
+			strchr(ConfigChannel.disabledmodes, "q") ? "" : "q",
 			ConfigChannel.use_invex ? "I" : "");
 }
 
diff --git a/src/supported.c b/src/supported.c
index abeb60c..6fd8c39 100644
--- a/src/supported.c
+++ b/src/supported.c
@@ -238,9 +238,9 @@ isupport_chanmodes(const void *ptr)
 	rb_snprintf(result, sizeof result, "%s%sb%s,k,%sl%s,%s",
 			ConfigChannel.use_except ? "e" : "",
 			ConfigChannel.use_invex ? "I" : "",
-			strcasecmp(ConfigChannel.disabledmodes, "q") ? "" : "q",
+			strchr(ConfigChannel.disabledmodes, "q") ? "" : "q",
 			ConfigChannel.use_forward ? "f" : "",
-			strcasecmp(ConfigChannel.disabledmodes, "j") ? "" : "j",
+			strchr(ConfigChannel.disabledmodes, "j") ? "" : "j",
 			cflagsbuf);
 	return result;
 }