diff --git a/glx/indirect_dispatch_swap.c b/glx/indirect_dispatch_swap.c
index 7ebcc6330..3eeed00f3 100644
--- a/glx/indirect_dispatch_swap.c
+++ b/glx/indirect_dispatch_swap.c
@@ -81,18 +81,6 @@ bswap_ENUM(const void *src)
     return x.ret;
 }
 
-static GLsync
-bswap_CARD64(const void *src)
-{
-    union {
-        uint64_t dst;
-        GLsync ret;
-    } x;
-
-    x.dst = bswap_64(*(uint64_t *) src);
-    return x.ret;
-}
-
 static GLdouble
 bswap_FLOAT64(const void *src)
 {