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diff --git a/libui_linux_amd64.a b/libui_linux_amd64.a
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diff --git a/libui_windows_386.a b/libui_windows_386.a
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diff --git a/libui_windows_386.res b/libui_windows_386.res
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diff --git a/libui_windows_amd64.a b/libui_windows_amd64.a
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diff --git a/libui_windows_amd64.lib b/libui_windows_amd64.lib
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diff --git a/libui_windows_amd64.res.o b/libui_windows_amd64.res.o
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diff --git a/ui.h b/ui.h
index 3452791..c7a8858 100644
--- a/ui.h
+++ b/ui.h
@@ -12,8 +12,15 @@
 extern "C" {
 #endif
 
-// TODO add __declspec(dllimport) on windows
-#ifndef _UI_EXTERN
+// this macro is generated by cmake
+#ifdef libui_EXPORTS
+#ifdef _WIN32
+#define _UI_EXTERN __declspec(dllexport) extern
+#else
+#define _UI_EXTERN __attribute__((visibility("default"))) extern
+#endif
+#else
+// TODO add __declspec(dllimport) on windows, but only if not static
 #define _UI_EXTERN extern
 #endif