diff --git a/src/core/libraries/kernel/memory.cpp b/src/core/libraries/kernel/memory.cpp
index ddc556fcd..b0e910e3b 100644
--- a/src/core/libraries/kernel/memory.cpp
+++ b/src/core/libraries/kernel/memory.cpp
@@ -575,6 +575,12 @@ void* PS4_SYSV_ABI posix_mmap(void* addr, u64 len, s32 prot, s32 flags, s32 fd,
         "called addr = {}, len = {:#x}, prot = {:#x}, flags = {:#x}, fd = {}, phys_addr = {:#x}",
         fmt::ptr(addr), len, prot, flags, fd, phys_addr);
 
+    if (len == 0) {
+        // If length is 0, mmap returns EINVAL.
+        ErrSceToPosix(ORBIS_KERNEL_ERROR_EINVAL);
+        return reinterpret_cast<void*>(-1);
+    }
+
     void* addr_out;
     auto* memory = Core::Memory::Instance();
     const auto mem_prot = static_cast<Core::MemoryProt>(prot);