diff --git a/lib/dictBuilder/zdict.h b/lib/dictBuilder/zdict.h
index d61b5922..67dba70d 100644
--- a/lib/dictBuilder/zdict.h
+++ b/lib/dictBuilder/zdict.h
@@ -38,6 +38,19 @@
 extern "C" {
 #endif
 
+
+/*======  Export for Windows  ======*/
+/*!
+*  ZSTD_DLL_EXPORT :
+*  Enable exporting of functions when building a Windows DLL
+*/
+#if defined(_WIN32) && defined(ZSTD_DLL_EXPORT) && (ZSTD_DLL_EXPORT==1)
+#  define ZDICTLIB_API __declspec(dllexport)
+#else
+#  define ZDICTLIB_API
+#endif
+
+
 /*! ZDICT_trainFromBuffer() :
     Train a dictionary from an array of samples.
     Samples must be stored concatenated in a single flat buffer `samplesBuffer`,
@@ -50,13 +63,13 @@ extern "C" {
            In general, it's recommended to provide a few thousands samples, but this can vary a lot.
            It's recommended that total size of all samples be about ~x100 times the target size of dictionary.
 */
-size_t ZDICT_trainFromBuffer(void* dictBuffer, size_t dictBufferCapacity,
+ZDICTLIB_API size_t ZDICT_trainFromBuffer(void* dictBuffer, size_t dictBufferCapacity,
                        const void* samplesBuffer, const size_t* samplesSizes, unsigned nbSamples);
 
 
 /*======   Helper functions   ======*/
-unsigned ZDICT_isError(size_t errorCode);
-const char* ZDICT_getErrorName(size_t errorCode);
+ZDICTLIB_API unsigned ZDICT_isError(size_t errorCode);
+ZDICTLIB_API const char* ZDICT_getErrorName(size_t errorCode);
 
 
 
diff --git a/lib/zstd.h b/lib/zstd.h
index 056940ff..dbca06cd 100644
--- a/lib/zstd.h
+++ b/lib/zstd.h
@@ -92,7 +92,7 @@ ZSTDLIB_API size_t ZSTD_compress( void* dst, size_t dstCapacity,
 *             Always ensure result fits within application's authorized limits !
 *             Each application can set its own limits.
 *    note 4 : when `return==0`, if precise failure cause is needed, use ZSTD_getFrameParams() to know more. */
-unsigned long long ZSTD_getDecompressedSize(const void* src, size_t srcSize);
+ZSTDLIB_API unsigned long long ZSTD_getDecompressedSize(const void* src, size_t srcSize);
 
 /*! ZSTD_decompress() :
     `compressedSize` : must be the _exact_ size of compressed input, otherwise decompression will fail.