diff --git a/utils/collectd/Makefile b/utils/collectd/Makefile
index 96080f5f0..29aec706f 100644
--- a/utils/collectd/Makefile
+++ b/utils/collectd/Makefile
@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=collectd
 PKG_VERSION:=5.11.0
-PKG_RELEASE:=3
+PKG_RELEASE:=4
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.bz2
 PKG_SOURCE_URL:=https://collectd.org/files/ \
diff --git a/utils/collectd/files/exec-scripts/sqm_collectd.sh b/utils/collectd/files/exec-scripts/sqm_collectd.sh
index 1fda2cb40..a2927854e 100755
--- a/utils/collectd/files/exec-scripts/sqm_collectd.sh
+++ b/utils/collectd/files/exec-scripts/sqm_collectd.sh
@@ -9,7 +9,7 @@ handle_cake() {
 	local ifc ifr tin i
 
 	ifc="$1"
-	ifr="${ifc//./_}"
+	ifr="${ifc//[!0-9A-Za-z]/_}"
 
 	# Overall
 	json_get_vars bytes packets drops backlog qlen