diff --git a/ci/toolchain_install.sh b/ci/toolchain_install.sh
index 8de6fff9..4aeef0a4 100755
--- a/ci/toolchain_install.sh
+++ b/ci/toolchain_install.sh
@@ -22,7 +22,7 @@ riscv()
 
 llvm()
 {
-    for x in {a..f} 
+    for x in {a..b} 
     do
         wget $REPOSITORY/llvm-riscv/ubuntu/bionic/llvm-riscv.tar.bz2.parta$x
     done