diff --git a/src/mux_h2.c b/src/mux_h2.c
index d02168d..c06d5d6 100644
--- a/src/mux_h2.c
+++ b/src/mux_h2.c
@@ -2316,6 +2316,7 @@
 				break;
 			}
 
+			padlen = 0;
 			if (h2_ft_bit(hdr.ft) & H2_FT_PADDED_MASK && hdr.ff & H2_F_PADDED) {
 				/* If the frame is padded (HEADERS, PUSH_PROMISE or DATA),
 				 * we read the pad length and drop it from the remaining