diff --git a/aegisub/configure.in b/aegisub/configure.in
index cd341ccda..fdac62d71 100644
--- a/aegisub/configure.in
+++ b/aegisub/configure.in
@@ -657,7 +657,7 @@ int main (void) {
   SwsContext *swsc = NULL;
 
   av_register_all();
-  fc = av_alloc_format_context();
+  fc = avformat_alloc_context();
   if (fc == NULL) {
     printf("avformat failure\n");
     return 1;