diff --git a/src/RagePhoto.cpp b/src/RagePhoto.cpp
index eae1b08..dfb91ef 100644
--- a/src/RagePhoto.cpp
+++ b/src/RagePhoto.cpp
@@ -33,6 +33,7 @@
 #elif defined UNICODE_ICONV
 #include <iconv.h>
 #elif defined UNICODE_WINCVT
+#include <windows.h>
 #include <stringapiset.h>
 #endif
 
diff --git a/tests/WincvtTest.cpp b/tests/WincvtTest.cpp
index e3763f9..cd816ce 100644
--- a/tests/WincvtTest.cpp
+++ b/tests/WincvtTest.cpp
@@ -17,6 +17,7 @@
 *****************************************************************************/
 
 #include <cstring>
+#include <windows.h>
 #include <stringapiset.h>
 
 int main(int argc, char *argv[])