diff --git a/include/epoxy/gl.h b/include/epoxy/gl.h
index bbc06c0..0be3a66 100644
--- a/include/epoxy/gl.h
+++ b/include/epoxy/gl.h
@@ -93,9 +93,9 @@ extern "C" {
 
 #include "epoxy/gl_generated.h"
 
-bool epoxy_has_gl_extension(const char *extension);
-bool epoxy_is_desktop_gl(void);
-int epoxy_gl_version(void);
+EPOXY_IMPORTEXPORT bool epoxy_has_gl_extension(const char *extension);
+EPOXY_IMPORTEXPORT bool epoxy_is_desktop_gl(void);
+EPOXY_IMPORTEXPORT int epoxy_gl_version(void);
 
 #ifdef __cplusplus
 } /* extern "C" */
diff --git a/include/epoxy/wgl.h b/include/epoxy/wgl.h
index 2c4682f..fdd7b4f 100644
--- a/include/epoxy/wgl.h
+++ b/include/epoxy/wgl.h
@@ -54,8 +54,8 @@ extern "C" {
 
 #include "epoxy/wgl_generated.h"
 
-bool epoxy_has_wgl_extension(HDC hdc, const char *extension);
-void epoxy_handle_external_wglMakeCurrent(void);
+EPOXY_IMPORTEXPORT bool epoxy_has_wgl_extension(HDC hdc, const char *extension);
+EPOXY_IMPORTEXPORT void epoxy_handle_external_wglMakeCurrent(void);
 
 #ifdef __cplusplus
 } /* extern "C" */