diff --git a/CMakeLists.txt b/CMakeLists.txt
index dbe3b6a..0bd5ec8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -48,6 +48,10 @@ add_library(olm
     lib/curve25519-donna/curve25519-donna.c)
 add_library(Olm::Olm ALIAS olm)
 
+# restrict the exported symbols
+set(CMAKE_SHARED_LINKER_FLAGS ${CMAKE_SHARED_LINKER_FLAGS} -Wl,--version-script=${CMAKE_CURRENT_SOURCE_DIR}/libolm.version)
+set_target_properties(olm PROPERTIES LINK_DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/libolm.version)
+
 target_include_directories(olm
     PUBLIC
         $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
diff --git a/libolm.version b/libolm.version
new file mode 100644
index 0000000..f93b6f2
--- /dev/null
+++ b/libolm.version
@@ -0,0 +1,4 @@
+{
+  global: olm*; _olm*; megolm*; _ZN3olm*;
+  local: *;
+};