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diff --git a/src/webp/types.h b/src/webp/types.h
index 0ce2622..69f7e89 100644
--- a/src/webp/types.h
+++ b/src/webp/types.h
@@ -39,7 +39,9 @@ typedef long long int int64_t;
#ifndef WEBP_EXTERN
// This explicitly marks library functions and allows for changing the
// signature for e.g., Windows DLL builds.
-# if defined(__GNUC__) && __GNUC__ >= 4
+# if defined(_MSC_VER) && defined(WEBP_DLL)
+# define WEBP_EXTERN __declspec(dllexport)
+# elif defined(__GNUC__) && __GNUC__ >= 4
# define WEBP_EXTERN extern __attribute__ ((visibility ("default")))
# else
# define WEBP_EXTERN extern
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2501012..2e090e6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -16,2 +16,6 @@ project(WebP C)
+if(MSVC AND BUILD_SHARED_LIBS)
+ add_definitions(-DWEBP_DLL)
+endif()
+
# Options for coder / decoder executables.