diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index eff75483f..9e2f3c2f1 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -6,9 +6,9 @@ on:
       - 'main'
 
 env:
-  BUILDER_VERSION: v0.9.55
+  BUILDER_VERSION: clang_path
   BUILDER_HOST: https://d19elf31gohf1l.cloudfront.net
-  BUILDER_SOURCE: releases
+  BUILDER_SOURCE: channels
   PACKAGE_NAME: aws-c-common
   LINUX_BASE_IMAGE: ubuntu-18-x64
   RUN: ${{ github.run_id }}-${{ github.run_number }}
diff --git a/source/string.c b/source/string.c
index 2fd791230..8e1c8a259 100644
--- a/source/string.c
+++ b/source/string.c
@@ -190,7 +190,8 @@ struct aws_string *aws_string_new_from_array(struct aws_allocator *allocator, co
     AWS_PRECONDITION(allocator);
     AWS_PRECONDITION(AWS_MEM_IS_READABLE(bytes, len));
 
-    struct aws_string *str = aws_mem_acquire(allocator, offsetof(struct aws_string, bytes[len + 1]));
+    struct aws_string *str =
+        aws_mem_acquire(allocator, offsetof(struct aws_string, bytes) + (len + 1) * sizeof(uint8_t));
     if (!str) {
         return NULL;
     }