diff --git a/pc/webrtcsdp.cc b/pc/webrtcsdp.cc
index 2c34728917..f92baa1873 100644
--- a/pc/webrtcsdp.cc
+++ b/pc/webrtcsdp.cc
@@ -457,10 +457,15 @@ static bool GetLine(const std::string& message,
   // where <type> MUST be exactly one case-significant character and
   // <value> is structured text whose format depends on <type>.
   // Whitespace MUST NOT be used on either side of the "=" sign.
-  if (line->length() < 3 ||
-      !islower(cline[0]) ||
+  //
+  // However, an exception to the whitespace rule is made for "s=", since
+  // RFC4566 also says:
+  //
+  //   If a session has no meaningful name, the value "s= " SHOULD be used
+  //   (i.e., a single space as the session name).
+  if (line->length() < 3 || !islower(cline[0]) ||
       cline[1] != kSdpDelimiterEqual ||
-      cline[2] == kSdpDelimiterSpace) {
+      (cline[0] != kLineTypeSessionName && cline[2] == kSdpDelimiterSpace)) {
     *pos = line_begin;
     return false;
   }
diff --git a/pc/webrtcsdp_unittest.cc b/pc/webrtcsdp_unittest.cc
index 7a974c49f3..0ff5249738 100644
--- a/pc/webrtcsdp_unittest.cc
+++ b/pc/webrtcsdp_unittest.cc
@@ -3758,3 +3758,12 @@ TEST_F(WebRtcSdpTest, SerializeAndDeserializeWithConnectionAddress) {
   EXPECT_EQ(video_desc_->connection_address().ToString(),
             video_desc->connection_address().ToString());
 }
+
+// RFC4566 says "If a session has no meaningful name, the value "s= " SHOULD be
+// used (i.e., a single space as the session name)." So we should accept that.
+TEST_F(WebRtcSdpTest, DeserializeEmptySessionName) {
+  JsepSessionDescription jsep_desc(kDummyType);
+  std::string sdp = kSdpString;
+  Replace("s=-\r\n", "s= \r\n", &sdp);
+  EXPECT_TRUE(SdpDeserialize(sdp, &jsep_desc));
+}