diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 705a1c8..c579fbc 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -30,6 +30,7 @@ jobs:
             ${{ matrix.module }}/go.sum
       - run: go test -race -covermode=atomic -coverprofile=cover.out ./...
       - run: go vet ./...
+      - run: GOOS=linux GOARCH=386 go vet ./... && GOOS=linux GOARCH=arm go vet ./...
       - if: matrix.module == 'dbkit/sqlite' || matrix.module == 'gonsole/auth/sqlite' || matrix.module == 'gonsole'
         run: GOOS=darwin GOARCH=arm64 go vet ./... && GOOS=windows GOARCH=amd64 go vet ./...
 
@@ -68,6 +69,7 @@ jobs:
             ${{ matrix.module }}/go.sum
       - run: go test -race -covermode=atomic -coverprofile=cover.out ./...
       - run: go vet ./...
+      - run: GOOS=linux GOARCH=386 go vet ./... && GOOS=linux GOARCH=arm go vet ./...
 
   gottext:
     runs-on: ubuntu-latest
diff --git a/dbkit/postgres/open_test.go b/dbkit/postgres/open_test.go
index dcd43e4..ef510c7 100644
--- a/dbkit/postgres/open_test.go
+++ b/dbkit/postgres/open_test.go
@@ -13,6 +13,7 @@ import (
 	"os"
 	"os/exec"
 	"path/filepath"
+	"strconv"
 	"strings"
 	"testing"
 	"time"
@@ -240,20 +241,34 @@ func openFreshHandle(t *testing.T, maxConns int) *postgres.Handle {
 	return mustOpen(t, openFresh(t), maxConns)
 }
 
+// openCapCase is one connection cap Open refuses and the error it returns.
+type openCapCase struct {
+	// name names the case.
+	name string
+	// maxConns is the connection cap Open is given.
+	maxConns int
+	// want is the error Open returns.
+	want string
+}
+
 func TestOpenRefusesABadOption(t *testing.T) {
 	t.Parallel()
 
-	cases := []struct {
-		name     string
-		maxConns int
-		want     string
-	}{
+	cases := []openCapCase{
 		{"a missing connection cap", 0, "dbkit: the option MaxConns must be 2 or more, got 0"},
 		{"a connection cap of one", 1, "dbkit: the option MaxConns must be 2 or more, got 1"},
 		{"a negative connection cap", -1, "dbkit: the option MaxConns must be 2 or more, got -1"},
-		{"a connection cap past 32 bits", math.MaxInt32 + 1,
-			"dbkit: the option MaxConns must be 2147483647 or less, got 2147483648"},
 	}
+
+	if strconv.IntSize == 64 {
+		past32 := int64(math.MaxInt32) + 1
+		cases = append(cases, openCapCase{
+			name:     "a connection cap past 32 bits",
+			maxConns: int(past32),
+			want:     "dbkit: the option MaxConns must be 2147483647 or less, got 2147483648",
+		})
+	}
+
 	for _, c := range cases {
 		t.Run(c.name, func(t *testing.T) {
 			t.Parallel()
diff --git a/dbkit/sqlite/options_test.go b/dbkit/sqlite/options_test.go
index 47cd6f7..c0f5f1e 100644
--- a/dbkit/sqlite/options_test.go
+++ b/dbkit/sqlite/options_test.go
@@ -7,6 +7,7 @@ import (
 	"math"
 	"os"
 	"path/filepath"
+	"strconv"
 	"testing"
 	"time"
 
@@ -60,14 +61,20 @@ func limitOf(n int64) *int64 {
 	return &n
 }
 
+// optionsCase is one bad change to valid options and the error Open returns.
+type optionsCase struct {
+	// name names the case.
+	name string
+	// change makes the one bad change to valid options.
+	change func(*sqlite.Options)
+	// want is the error Open returns.
+	want string
+}
+
 func TestOpenRefusesABadOption(t *testing.T) {
 	t.Parallel()
 
-	cases := []struct {
-		name   string
-		change func(*sqlite.Options)
-		want   string
-	}{
+	cases := []optionsCase{
 		{"a missing busy timeout", func(o *sqlite.Options) { o.BusyTimeout = 0 },
 			"dbkit: the option BusyTimeout must be 1ms or more, got 0s"},
 		{"a negative busy timeout", func(o *sqlite.Options) { o.BusyTimeout = -time.Millisecond },
@@ -98,8 +105,6 @@ func TestOpenRefusesABadOption(t *testing.T) {
 			"dbkit: the option CacheSize must stand above zero, got 0"},
 		{"a negative cache size", func(o *sqlite.Options) { o.CacheSize = -1 },
 			"dbkit: the option CacheSize must stand above zero, got -1"},
-		{"a cache size past 32 bits", func(o *sqlite.Options) { o.CacheSize = math.MaxInt32 + 1 },
-			"dbkit: the option CacheSize must be 2147483647 or less, got 2147483648"},
 		{"a missing connection cap", func(o *sqlite.Options) { o.MaxConns = 0 },
 			"dbkit: the option MaxConns must be 2 or more, got 0"},
 		{"a negative connection cap", func(o *sqlite.Options) { o.MaxConns = -2 },
@@ -119,6 +124,16 @@ func TestOpenRefusesABadOption(t *testing.T) {
 		{"a base folder with a question mark", func(o *sqlite.Options) { o.BaseFolder = "/srv/a?b" },
 			`dbkit: the option BaseFolder must hold no ?, got "/srv/a?b"`},
 	}
+
+	if strconv.IntSize == 64 {
+		past32 := int64(math.MaxInt32) + 1
+		cases = append(cases, optionsCase{
+			name:   "a cache size past 32 bits",
+			change: func(o *sqlite.Options) { o.CacheSize = int(past32) },
+			want:   "dbkit: the option CacheSize must be 2147483647 or less, got 2147483648",
+		})
+	}
+
 	for _, c := range cases {
 		t.Run(c.name, func(t *testing.T) {
 			t.Parallel()