diff --git a/README.md b/README.md
index 05a63f66d..a99632954 100644
--- a/README.md
+++ b/README.md
@@ -8,6 +8,9 @@ TDLight is 100% compatible with tdlib, if you don't use the sqlite database.
 TDLight can clean itself and release some ram to the OS if you want. Look at **TdApi.OptimizeMemory** in "Modified features" paragraph to see how.
 ### Constant memory usage
 TDLight if used with care doesn't grow in memory usage with time. Look at **TdApi.OptimizeMemory** in "Modified features" paragraph to see how
+
+![memory usage](info/memory-usage.jpg)
+
 ### Custom options
 We added some options:
 * **disable_minithumbnails** (true/false) This setting removes minithumbnails everywhere. It reduces memory usage because tdlib keeps them in RAM.
diff --git a/info/memory-usage.jpg b/info/memory-usage.jpg
new file mode 100644
index 000000000..4d3dc9dfc
Binary files /dev/null and b/info/memory-usage.jpg differ
diff --git a/td/telegram/MemoryManager.cpp b/td/telegram/MemoryManager.cpp
index 0b93950cd..797fc4c3a 100644
--- a/td/telegram/MemoryManager.cpp
+++ b/td/telegram/MemoryManager.cpp
@@ -178,7 +178,9 @@ void MemoryManager::clean_memory(bool full, Promise<Unit> promise) const {
   td_->file_manager_->memory_cleanup();
 
   #ifdef __linux__
-    malloc_trim(0);
+    #if defined(__GLIBC__) && !defined(__UCLIBC__) && !defined(__MUSL__)
+      malloc_trim(0);
+    #endif
   #endif
 
   promise.set_value(Unit());