diff --git a/include/libyuv/convert_from.h b/include/libyuv/convert_from.h
index 7544d3eb8..afc43939a 100644
--- a/include/libyuv/convert_from.h
+++ b/include/libyuv/convert_from.h
@@ -23,6 +23,7 @@ extern "C" {
 
 // Convert 8 bit YUV to 10 bit.
 #define H420ToH010 I420ToI010
+LIBYUV_API
 int I420ToI010(const uint8_t* src_y,
                int src_stride_y,
                const uint8_t* src_u,