diff --git a/reg-tests/cache/if-modified-since.vtc b/reg-tests/cache/if-modified-since.vtc
index 8ae1cce..387fc7e 100644
--- a/reg-tests/cache/if-modified-since.vtc
+++ b/reg-tests/cache/if-modified-since.vtc
@@ -62,6 +62,10 @@
                server www ${s1_addr}:${s1_port}
                http-response cache-store my_cache
 
+               # Remove Transfer-Encoding header because of a vtest issue with
+               # 304-Not-Modified responses
+               http-after-response del-header transfer-encoding if { status eq 304 }
+
        cache my_cache
                total-max-size 3
                max-age 20
@@ -149,4 +153,3 @@
        expect resp.bodylen == 0
 
 } -run
-
diff --git a/reg-tests/cache/if-none-match.vtc b/reg-tests/cache/if-none-match.vtc
index ba3336a..bc7d67b 100644
--- a/reg-tests/cache/if-none-match.vtc
+++ b/reg-tests/cache/if-none-match.vtc
@@ -47,6 +47,10 @@
                server www ${s1_addr}:${s1_port}
                http-response cache-store my_cache
 
+               # Remove Transfer-Encoding header because of a vtest issue with
+               # 304-Not-Modified responses
+               http-after-response del-header transfer-encoding if { status eq 304 }
+
        cache my_cache
                total-max-size 3
                max-age 20