1 files changed, 1 insertions, 1 deletions
diff --git a/src/va.c b/src/va.c
index 6bc9c06..2cdbe02 100644
--- a/src/va.c
+++ b/src/va.c
@@ -58,7 +58,7 @@ static int va_debug_trace = 0;
 static int vaDisplayIsValid(VADisplay dpy)
 {
   VADisplayContextP pDisplayContext = (VADisplayContextP)dpy;
-  return pDisplayContext && pDisplayContext->vaIsValid(pDisplayContext);
+  return pDisplayContext && (pDisplayContext->vadpy_magic == 0x789abcde) && pDisplayContext->vaIsValid(pDisplayContext);
 }
 
 static void va_errorMessage(const char *msg, ...)