diff --git a/include/sspi.h b/include/sspi.h
index 459de140bb1..dffc7a4d413 100644
--- a/include/sspi.h
+++ b/include/sspi.h
@@ -63,8 +63,11 @@ typedef struct _SecHandle
 typedef SecHandle CredHandle;
 typedef PSecHandle PCredHandle;
 
+#ifndef __WINE_CTXTHANDLE_DEFINED__
+#define __WINE_CTXTHANDLE_DEFINED__
 typedef SecHandle CtxtHandle;
 typedef PSecHandle PCtxtHandle;
+#endif
 
 typedef struct _SECURITY_INTEGER
 {
diff --git a/include/wincred.h b/include/wincred.h
index d041bb38418..9679b57f5ee 100644
--- a/include/wincred.h
+++ b/include/wincred.h
@@ -32,8 +32,11 @@ typedef struct _SecHandle
 } SecHandle, *PSecHandle;
 #endif
 
+#ifndef __WINE_CTXTHANDLE_DEFINED__
+#define __WINE_CTXTHANDLE_DEFINED__
 typedef SecHandle CtxtHandle;
 typedef PSecHandle PCtxtHandle;
+#endif
 
 typedef struct _CREDENTIAL_ATTRIBUTEA
 {