diff --git a/net/core/filter.c b/net/core/filter.c
index 13079f03902e7674b7cd71bf01ca1d12844c758b..05a04ea871728d2c18f68571321e9435df1f3b18 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -478,9 +478,9 @@ do_pass:
 				bpf_src = BPF_X;
 			} else {
 				insn->dst_reg = BPF_REG_A;
-				insn->src_reg = BPF_REG_X;
 				insn->imm = fp->k;
 				bpf_src = BPF_SRC(fp->code);
+				insn->src_reg = bpf_src == BPF_X ? BPF_REG_X : 0;
 			}
 
 			/* Common case where 'jump_false' is next insn. */