diff --git a/net/http/parsehttpmessage.c b/net/http/parsehttpmessage.c
index c7b560dbe..85010465c 100644
--- a/net/http/parsehttpmessage.c
+++ b/net/http/parsehttpmessage.c
@@ -236,8 +236,12 @@ int ParseHttpMessage(struct HttpMessage *r, const char *p, size_t n) {
                 unsigned c2;
                 struct HttpHeader *p1, *p2;
                 p1 = r->xheaders.p;
-                c2 = r->xheaders.c + 2;
-                c2 = c2 >> 1;
+                c2 = r->xheaders.c;
+                if (c2 == 0) {
+                  c2 = 1;
+                } else {
+                  c2 = c2 * 2;
+                }
                 if ((p2 = realloc(p1, c2 * sizeof(*p1)))) {
                   r->xheaders.p = p2;
                   r->xheaders.c = c2;
diff --git a/test/net/http/parsehttpmessage_test.c b/test/net/http/parsehttpmessage_test.c
index 4adbf900f..d46f0dcba 100644
--- a/test/net/http/parsehttpmessage_test.c
+++ b/test/net/http/parsehttpmessage_test.c
@@ -16,11 +16,11 @@
 │ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
-#include "libc/intrin/bits.h"
 #include "libc/errno.h"
+#include "libc/intrin/bits.h"
 #include "libc/log/check.h"
-#include "libc/mem/mem.h"
 #include "libc/mem/gc.internal.h"
+#include "libc/mem/mem.h"
 #include "libc/stdio/stdio.h"
 #include "libc/str/str.h"
 #include "libc/testlib/ezbench.h"
@@ -245,6 +245,29 @@ Content-Type: text/plain\r\n\
   ASSERT_EQ(0, req->xheaders.n);
 }
 
+TEST(ParseHttpMessage, testCommaSeparatedOnMultipleLines_manyLines) {
+  static const char m[] = "\
+GET / HTTP/1.1\r\n\
+Accept: text/html\r\n\
+Accept: text/plain\r\n\
+Accept: text/csv\r\n\
+Accept: text/xml\r\n\
+Accept: text/css\r\n\
+\r\n";
+  InitHttpMessage(req, kHttpRequest);
+  EXPECT_EQ(strlen(m), ParseHttpMessage(req, m, strlen(m)));
+  EXPECT_STREQ("text/html", gc(slice(m, req->headers[kHttpAccept])));
+  ASSERT_EQ(4, req->xheaders.n);
+  EXPECT_STREQ("Accept", gc(slice(m, req->xheaders.p[0].k)));
+  EXPECT_STREQ("text/plain", gc(slice(m, req->xheaders.p[0].v)));
+  EXPECT_STREQ("Accept", gc(slice(m, req->xheaders.p[1].k)));
+  EXPECT_STREQ("text/csv", gc(slice(m, req->xheaders.p[1].v)));
+  EXPECT_STREQ("Accept", gc(slice(m, req->xheaders.p[2].k)));
+  EXPECT_STREQ("text/xml", gc(slice(m, req->xheaders.p[2].v)));
+  EXPECT_STREQ("Accept", gc(slice(m, req->xheaders.p[3].k)));
+  EXPECT_STREQ("text/css", gc(slice(m, req->xheaders.p[3].v)));
+}
+
 TEST(ParseHttpMessage, testCommaSeparatedOnMultipleLines_becomesLinear) {
   static const char m[] = "\
 GET / HTTP/1.1\r\n\