diff --git a/pc/dtmfsender.cc b/pc/dtmfsender.cc
index 7a98bc32dd..8378eb9a07 100644
--- a/pc/dtmfsender.cc
+++ b/pc/dtmfsender.cc
@@ -41,11 +41,13 @@ static const char kDtmfValidTones[] = ",0123456789*#ABCDabcd";
 static const char kDtmfTonesTable[] = ",0123456789*#ABCD";
 // The duration cannot be more than 6000ms or less than 40ms. The gap between
 // tones must be at least 50 ms.
+// Source for values: W3C WEBRTC specification.
+// https://w3c.github.io/webrtc-pc/#dom-rtcdtmfsender-insertdtmf
 static const int kDtmfDefaultDurationMs = 100;
 static const int kDtmfMinDurationMs = 40;
 static const int kDtmfMaxDurationMs = 6000;
 static const int kDtmfDefaultGapMs = 50;
-static const int kDtmfMinGapMs = 50;
+static const int kDtmfMinGapMs = 30;
 
 // Get DTMF code from the DTMF event character.
 bool GetDtmfCode(char tone, int* code) {
diff --git a/pc/dtmfsender_unittest.cc b/pc/dtmfsender_unittest.cc
index a5d102b5f2..ddccc448f6 100644
--- a/pc/dtmfsender_unittest.cc
+++ b/pc/dtmfsender_unittest.cc
@@ -331,7 +331,7 @@ TEST_F(DtmfSenderTest, InsertDtmfWithInvalidDurationOrGap) {
 
   EXPECT_FALSE(dtmf_->InsertDtmf(tones, 6001, inter_tone_gap));
   EXPECT_FALSE(dtmf_->InsertDtmf(tones, 39, inter_tone_gap));
-  EXPECT_FALSE(dtmf_->InsertDtmf(tones, duration, 49));
+  EXPECT_FALSE(dtmf_->InsertDtmf(tones, duration, 29));
 
   EXPECT_TRUE(dtmf_->InsertDtmf(tones, duration, inter_tone_gap));
 }