diff --git a/z/mmap_unix.go b/z/mmap_unix.go
index e8b2699c..629449f9 100644
--- a/z/mmap_unix.go
+++ b/z/mmap_unix.go
@@ -1,4 +1,5 @@
-// +build !windows,!darwin,!plan9,!linux
+//go:build !windows && !darwin && !plan9 && !linux && !wasip1
+// +build !windows,!darwin,!plan9,!linux,!wasip1
 
 /*
  * Copyright 2019 Dgraph Labs, Inc. and Contributors
diff --git a/z/mmap_wasip1.go b/z/mmap_wasip1.go
new file mode 100644
index 00000000..94f71484
--- /dev/null
+++ b/z/mmap_wasip1.go
@@ -0,0 +1,40 @@
+//go:build wasip1
+
+/*
+ * Copyright 2023 Dgraph Labs, Inc. and Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package z
+
+import (
+	"os"
+	"syscall"
+)
+
+func mmap(fd *os.File, writeable bool, size int64) ([]byte, error) {
+	return nil, syscall.ENOSYS
+}
+
+func munmap(b []byte) error {
+	return syscall.ENOSYS
+}
+
+func madvise(b []byte, readahead bool) error {
+	return syscall.ENOSYS
+}
+
+func msync(b []byte) error {
+	return syscall.ENOSYS
+}