diff --git a/headers/private/kernel/vm/VMCache.h b/headers/private/kernel/vm/VMCache.h
index 8807079d0d..504f4f655f 100644
--- a/headers/private/kernel/vm/VMCache.h
+++ b/headers/private/kernel/vm/VMCache.h
@@ -198,6 +198,7 @@ public:
 				// TODO: Remove!
 			uint32				page_count;
 			uint32				temporary : 1;
+			uint32				unmergeable : 1;
 			uint32				type : 6;
 
 #if DEBUG_CACHE_LIST
diff --git a/src/add-ons/kernel/file_systems/ramfs/DataContainer.cpp b/src/add-ons/kernel/file_systems/ramfs/DataContainer.cpp
index 491dd9dbfa..054deced6e 100644
--- a/src/add-ons/kernel/file_systems/ramfs/DataContainer.cpp
+++ b/src/add-ons/kernel/file_systems/ramfs/DataContainer.cpp
@@ -255,6 +255,7 @@ DataContainer::_SwitchToCacheMode()
 		return error;
 
 	fCache->temporary = 1;
+	fCache->unmergeable = 1;
 	fCache->virtual_end = fSize;
 
 	error = fCache->Commit(fSize, VM_PRIORITY_USER);
diff --git a/src/system/kernel/vm/VMCache.cpp b/src/system/kernel/vm/VMCache.cpp
index 1e8a27b9d9..f04a2b90e2 100644
--- a/src/system/kernel/vm/VMCache.cpp
+++ b/src/system/kernel/vm/VMCache.cpp
@@ -627,8 +627,8 @@ VMCacheRef::VMCacheRef(VMCache* cache)
 bool
 VMCache::_IsMergeable() const
 {
-	return areas == NULL && temporary && !consumers.IsEmpty()
-		&& consumers.Head() == consumers.Tail();
+	return areas == NULL && temporary && !unmergeable
+		&& !consumers.IsEmpty() && consumers.Head() == consumers.Tail();
 }
 
 
@@ -657,6 +657,7 @@ VMCache::Init(uint32 cacheType, uint32 allocationFlags)
 	virtual_end = 0;
 	committed_size = 0;
 	temporary = 0;
+	unmergeable = 0;
 	page_count = 0;
 	fWiredPagesCount = 0;
 	type = cacheType;