diff --git a/bench_test.go b/bench_test.go
index 35192315..c5418fbb 100644
--- a/bench_test.go
+++ b/bench_test.go
@@ -15,12 +15,6 @@ var float4TextVsBinaryTestDataLoaded bool
 var float8TextVsBinaryTestDataLoaded bool
 var boolTextVsBinaryTestDataLoaded bool
 
-func mustPrepare(b *testing.B, conn *Connection, name, sql string) {
-	if err := conn.Prepare(name, sql); err != nil {
-		b.Fatalf("Could not prepare %v: %v", name, err)
-	}
-}
-
 func createNarrowTestData(b *testing.B, conn *Connection) {
 	if narrowTestDataLoaded {
 		return
diff --git a/helper_test.go b/helper_test.go
new file mode 100644
index 00000000..bc2eb945
--- /dev/null
+++ b/helper_test.go
@@ -0,0 +1,11 @@
+package pgx
+
+type test interface {
+	Fatalf(format string, args ...interface{})
+}
+
+func mustPrepare(t test, conn *Connection, name, sql string) {
+	if err := conn.Prepare(name, sql); err != nil {
+		t.Fatalf("Could not prepare %v: %v", name, err)
+	}
+}