diff --git a/internal/codegen/golang/templates/pgx/interfaceCode.tmpl b/internal/codegen/golang/templates/pgx/interfaceCode.tmpl
index 510332a0b4..c8bedb997c 100644
--- a/internal/codegen/golang/templates/pgx/interfaceCode.tmpl
+++ b/internal/codegen/golang/templates/pgx/interfaceCode.tmpl
@@ -28,9 +28,9 @@
             {{.MethodName}}(ctx context.Context, {{.Arg.Pair}}) (pgconn.CommandTag, error)
         {{- end}}
         {{- if and (eq .Cmd ":copyfrom") ($dbtxParam) }}
-            {{.MethodName}}(ctx context.Context, db DBTX, {{.Arg.Pair}}) (int64, error)
+            {{.MethodName}}(ctx context.Context, db DBTX, {{.Arg.SlicePair}}) (int64, error)
         {{- else if eq .Cmd ":copyfrom" }}
-            {{.MethodName}}(ctx context.Context, {{.Arg.Pair}}) (int64, error)
+            {{.MethodName}}(ctx context.Context, {{.Arg.SlicePair}}) (int64, error)
         {{- end}}
     {{- end}}
     }
diff --git a/internal/endtoend/testdata/copyfrom/postgresql/pgx/go/querier.go b/internal/endtoend/testdata/copyfrom/postgresql/pgx/go/querier.go
new file mode 100644
index 0000000000..0e8a44f548
--- /dev/null
+++ b/internal/endtoend/testdata/copyfrom/postgresql/pgx/go/querier.go
@@ -0,0 +1,15 @@
+// Code generated by sqlc. DO NOT EDIT.
+
+package querytest
+
+import (
+	"context"
+	"database/sql"
+)
+
+type Querier interface {
+	InsertSingleValue(ctx context.Context, a []sql.NullString) (int64, error)
+	InsertValues(ctx context.Context, arg []InsertValuesParams) (int64, error)
+}
+
+var _ Querier = (*Queries)(nil)
diff --git a/internal/endtoend/testdata/copyfrom/postgresql/pgx/sqlc.json b/internal/endtoend/testdata/copyfrom/postgresql/pgx/sqlc.json
index 9403bd0279..2ec707567a 100644
--- a/internal/endtoend/testdata/copyfrom/postgresql/pgx/sqlc.json
+++ b/internal/endtoend/testdata/copyfrom/postgresql/pgx/sqlc.json
@@ -7,7 +7,8 @@
       "sql_package": "pgx/v4",
       "name": "querytest",
       "schema": "query.sql",
-      "queries": "query.sql"
+      "queries": "query.sql",
+      "emit_interface": true
     }
   ]
 }