diff --git a/target/sdk/files/Makefile b/target/sdk/files/Makefile
index 493b7ce82..4968a6318 100644
--- a/target/sdk/files/Makefile
+++ b/target/sdk/files/Makefile
@@ -14,7 +14,7 @@ export TOPDIR LC_ALL LANG SDK
 
 world:
 
-DISTRO_PKG_CONFIG:=$(shell which -a pkg-config | grep -E '\/usr' -m 1)
+DISTRO_PKG_CONFIG:=$(shell which -a pkg-config | grep '/usr' -m 1)
 export PATH:=$(TOPDIR)/staging_dir/host/bin:$(PATH)
 
 ifneq ($(OPENWRT_BUILD),1)