diff --git a/CMakeLists.txt b/CMakeLists.txt
index 334b5c3865..5f51997f2e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1785,7 +1785,8 @@ check_function_exists("setlocale"       HAVE_SETLOCALE)
 check_function_exists("setrlimit"       HAVE_SETRLIMIT)
 
 if(WIN32)
-  check_symbol_exists("if_nametoindex"  "winsock2.h;iphlpapi.h" HAVE_IF_NAMETOINDEX)  # Windows Vista+ non-UWP
+  # include wincrypt.h as a workaround for mingw-w64 __MINGW64_VERSION_MAJOR <= 5 header bug */
+  check_symbol_exists("if_nametoindex"  "winsock2.h;wincrypt.h;iphlpapi.h" HAVE_IF_NAMETOINDEX)  # Windows Vista+ non-UWP */
 else()
   check_function_exists("if_nametoindex"  HAVE_IF_NAMETOINDEX)  # net/if.h
   check_function_exists("realpath"        HAVE_REALPATH)
diff --git a/configure.ac b/configure.ac
index acf253eadc..27c46bbffc 100644
--- a/configure.ac
+++ b/configure.ac
@@ -4275,6 +4275,7 @@ if test "$curl_cv_native_windows" = 'yes'; then
       #define WIN32_LEAN_AND_MEAN
       #endif
       #include <winsock2.h>
+      #include <wincrypt.h>  /* workaround for mingw-w64 __MINGW64_VERSION_MAJOR <= 5 header bug */
       #include <iphlpapi.h>
     ]],[[
       if_nametoindex("");
diff --git a/lib/url.c b/lib/url.c
index 3d78ceeed5..df2a332061 100644
--- a/lib/url.c
+++ b/lib/url.c
@@ -60,6 +60,9 @@
 #endif
 
 #if defined(HAVE_IF_NAMETOINDEX) && defined(_WIN32)
+#if defined(__MINGW32__) && (__MINGW64_VERSION_MAJOR <= 5)
+#include <wincrypt.h>  /* workaround for old mingw-w64 missing to include it */
+#endif
 #include <iphlpapi.h>
 #endif