diff --git a/mongoose.h b/mongoose.h
index a33eb424..e716cd51 100644
--- a/mongoose.h
+++ b/mongoose.h
@@ -371,6 +371,7 @@ typedef enum { false = 0, true = 1 } bool;
 #endif
 
 #include <process.h>
+#include <winerror.h>
 #include <winsock2.h>
 
 // Protect from calls like std::snprintf in app code
diff --git a/src/arch_win32.h b/src/arch_win32.h
index deada3ec..2616156a 100644
--- a/src/arch_win32.h
+++ b/src/arch_win32.h
@@ -47,6 +47,7 @@ typedef enum { false = 0, true = 1 } bool;
 #endif
 
 #include <process.h>
+#include <winerror.h>
 #include <winsock2.h>
 
 // Protect from calls like std::snprintf in app code