diff --git a/Kernel/Syscalls/mmap.cpp b/Kernel/Syscalls/mmap.cpp
index 543c1b0189a..eaf0f5c1b51 100644
--- a/Kernel/Syscalls/mmap.cpp
+++ b/Kernel/Syscalls/mmap.cpp
@@ -564,6 +564,9 @@ int Process::sys$msyscall(void* address)
     if (!region)
         return -EINVAL;
 
+    if (!region->is_mmap())
+        return -EINVAL;
+
     region->set_syscall_region(true);
     return 0;
 }