diff --git a/Kernel/Syscalls/mmap.cpp b/Kernel/Syscalls/mmap.cpp
index cfe775c20c..bf3030f524 100644
--- a/Kernel/Syscalls/mmap.cpp
+++ b/Kernel/Syscalls/mmap.cpp
@@ -5,6 +5,7 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
+#include <AK/kmalloc.h>
 #include <Kernel/Arch/SmapDisabler.h>
 #include <Kernel/Arch/x86/MSR.h>
 #include <Kernel/Arch/x86/SafeMem.h>
@@ -184,8 +185,16 @@ ErrorOr<FlatPtr> Process::sys$mmap(Userspace<const Syscall::SC_mmap_params*> use
         return EINVAL;
 
     Memory::Region* region = nullptr;
+    Memory::VirtualRange range { {}, 0 };
 
-    auto range = TRY([&]() -> ErrorOr<Memory::VirtualRange> {
+    ArmedScopeGuard scope_guard = [&] {
+        if (region)
+            address_space().deallocate_region(*region);
+        else if (range.is_valid())
+            address_space().page_directory().range_allocator().deallocate(range);
+    };
+
+    range = TRY([&]() -> ErrorOr<Memory::VirtualRange> {
         if (map_randomized)
             return address_space().page_directory().range_allocator().try_allocate_randomized(rounded_size, alignment);
 
@@ -248,6 +257,8 @@ ErrorOr<FlatPtr> Process::sys$mmap(Userspace<const Syscall::SC_mmap_params*> use
 
     PerformanceManager::add_mmap_perf_event(*this, *region);
 
+    scope_guard.disarm();
+
     return region->vaddr().get();
 }