diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 224191d..e09a9cf 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -47,9 +47,14 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
+        goarch:
+          - "386"
+          - amd64
         go-version:
           - 1.26.x
           - 1.27.x
+    env:
+      GOARCH: ${{ matrix.goarch }}
     steps:
       - uses: actions/checkout@v7
 
diff --git a/http.go b/http.go
index 8d9073c..70a788e 100644
--- a/http.go
+++ b/http.go
@@ -466,7 +466,7 @@ func WithMaxBodySize(maxBodyBytes int64) HTTPOption {
 		if maxBodyBytes <= 0 || maxBodyBytes == math.MaxInt64 {
 			return fmt.Errorf(
 				"maximum body size must be positive and below %d: %d",
-				math.MaxInt64,
+				int64(math.MaxInt64),
 				maxBodyBytes,
 			)
 		}