diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2f8fffb..9ea2b2b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -14,6 +14,8 @@ add_compile_options(-Wall -Wextra -Wformat
   -Werror
 )
 
+set(CMAKE_C_VISIBILITY_PRESET hidden)
+
 set(CMAKE_C_STANDARD 11)
 set(CMAKE_C_STANDARD_REQUIRED TRUE)
 set(CMAKE_C_EXTENSIONS FALSE)
diff --git a/include/ovni.h.in b/include/ovni.h.in
index 88c38ab..e54b744 100644
--- a/include/ovni.h.in
+++ b/include/ovni.h.in
@@ -4,6 +4,8 @@
 #ifndef OVNI_H
 #define OVNI_H
 
+#pragma GCC visibility push(default)
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -171,4 +173,6 @@ void ovni_flush(void);
 }
 #endif
 
+#pragma GCC visibility pop
+
 #endif /* OVNI_H */