diff --git a/CMakeLists.txt b/CMakeLists.txt
index a35e885..095fc2c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -82,6 +82,7 @@ if(CMAKE_C_COMPILER_ID MATCHES "AppleClang|Clang|GNU")
   list(APPEND mi_cflags -Wall -Wextra -Wno-unknown-pragmas -ftls-model=initial-exec)
   if(CMAKE_C_COMPILER_ID MATCHES "GNU")
     list(APPEND mi_cflags -Wno-invalid-memory-model)
+    list(APPEND mi_cflags -fvisibility=hidden)
   endif()
 endif()
 
diff --git a/src/alloc-override.c b/src/alloc-override.c
index 03bb2a0..e06a3e6 100644
--- a/src/alloc-override.c
+++ b/src/alloc-override.c
@@ -25,7 +25,7 @@ terms of the MIT license. A copy of the license can be found in the file
 
 #if (defined(__GNUC__) || defined(__clang__)) && !defined(__MACH__)
   // use aliasing to alias the exported function to one of our `mi_` functions
-  #define MI_FORWARD(fun)      __attribute__((alias(#fun), used));
+  #define MI_FORWARD(fun)      __attribute__((alias(#fun), used, visibility("default")));
   #define MI_FORWARD1(fun,x)   MI_FORWARD(fun)
   #define MI_FORWARD2(fun,x,y) MI_FORWARD(fun)
   #define MI_FORWARD0(fun,x)   MI_FORWARD(fun)
@@ -60,6 +60,10 @@ terms of the MIT license. A copy of the license can be found in the file
   void  free(void* p)                    mi_attr_noexcept  MI_FORWARD0(mi_free, p)
 #endif
 
+#if (defined(__GNUC__) || defined(__clang__)) && !defined(__MACH__)
+#pragma GCC visibility push(default)
+#endif
+
 // ------------------------------------------------------
 // Override new/delete
 // This is not really necessary as they usually call
@@ -189,4 +193,8 @@ void* reallocarray( void* p, size_t count, size_t size ) {  // BSD
 }
 #endif
 
+#if (defined(__GNUC__) || defined(__clang__)) && !defined(__MACH__)
+#pragma GCC visibility pop
+#endif
+
 #endif // MI_MALLOC_OVERRIDE & !_WIN32