diff --git a/ddtrace/tracer/span.go b/ddtrace/tracer/span.go
index efc3561a00..20dd45e330 100644
--- a/ddtrace/tracer/span.go
+++ b/ddtrace/tracer/span.go
@@ -364,7 +364,7 @@ func (s *span) Format(f fmt.State, c rune) {
 				fmt.Fprintf(f, "dd.version=%s ", v)
 			}
 		}
-		fmt.Fprintf(f, "dd.trace_id=%d dd.span_id=%d", s.TraceID, s.SpanID)
+		fmt.Fprintf(f, `dd.trace_id="%d" dd.span_id="%d"`, s.TraceID, s.SpanID)
 	default:
 		fmt.Fprintf(f, "%%!%c(ddtrace.Span=%v)", c, s)
 	}
diff --git a/ddtrace/tracer/span_test.go b/ddtrace/tracer/span_test.go
index 1108f0d598..7927aff02d 100644
--- a/ddtrace/tracer/span_test.go
+++ b/ddtrace/tracer/span_test.go
@@ -411,7 +411,7 @@ func TestSpanLog(t *testing.T) {
 		tracer, _, _, stop := startTestTracer(t, WithService("tracer.test"))
 		defer stop()
 		span := tracer.StartSpan("test.request").(*span)
-		expect := fmt.Sprintf("dd.service=tracer.test dd.trace_id=%d dd.span_id=%d", span.TraceID, span.SpanID)
+		expect := fmt.Sprintf(`dd.service=tracer.test dd.trace_id="%d" dd.span_id="%d"`, span.TraceID, span.SpanID)
 		assert.Equal(expect, fmt.Sprintf("%v", span))
 	})
 
@@ -420,7 +420,7 @@ func TestSpanLog(t *testing.T) {
 		tracer, _, _, stop := startTestTracer(t, WithService("tracer.test"), WithEnv("testenv"))
 		defer stop()
 		span := tracer.StartSpan("test.request").(*span)
-		expect := fmt.Sprintf("dd.service=tracer.test dd.env=testenv dd.trace_id=%d dd.span_id=%d", span.TraceID, span.SpanID)
+		expect := fmt.Sprintf(`dd.service=tracer.test dd.env=testenv dd.trace_id="%d" dd.span_id="%d"`, span.TraceID, span.SpanID)
 		assert.Equal(expect, fmt.Sprintf("%v", span))
 	})
 
@@ -429,7 +429,7 @@ func TestSpanLog(t *testing.T) {
 		tracer, _, _, stop := startTestTracer(t, WithService("tracer.test"), WithServiceVersion("1.2.3"))
 		defer stop()
 		span := tracer.StartSpan("test.request").(*span)
-		expect := fmt.Sprintf("dd.service=tracer.test dd.version=1.2.3 dd.trace_id=%d dd.span_id=%d", span.TraceID, span.SpanID)
+		expect := fmt.Sprintf(`dd.service=tracer.test dd.version=1.2.3 dd.trace_id="%d" dd.span_id="%d"`, span.TraceID, span.SpanID)
 		assert.Equal(expect, fmt.Sprintf("%v", span))
 	})
 
@@ -438,7 +438,7 @@ func TestSpanLog(t *testing.T) {
 		tracer, _, _, stop := startTestTracer(t, WithService("tracer.test"), WithServiceVersion("1.2.3"), WithEnv("testenv"))
 		defer stop()
 		span := tracer.StartSpan("test.request").(*span)
-		expect := fmt.Sprintf("dd.service=tracer.test dd.env=testenv dd.version=1.2.3 dd.trace_id=%d dd.span_id=%d", span.TraceID, span.SpanID)
+		expect := fmt.Sprintf(`dd.service=tracer.test dd.env=testenv dd.version=1.2.3 dd.trace_id="%d" dd.span_id="%d"`, span.TraceID, span.SpanID)
 		assert.Equal(expect, fmt.Sprintf("%v", span))
 	})
 
@@ -447,7 +447,7 @@ func TestSpanLog(t *testing.T) {
 		tracer, _, _, stop := startTestTracer(t, WithService("tracer.test"), WithServiceVersion("1.2.3"), WithEnv("testenv"))
 		defer stop()
 		span := tracer.StartSpan("test.request", ServiceName("subservice name")).(*span)
-		expect := fmt.Sprintf("dd.service=tracer.test dd.env=testenv dd.version=1.2.3 dd.trace_id=%d dd.span_id=%d", span.TraceID, span.SpanID)
+		expect := fmt.Sprintf(`dd.service=tracer.test dd.env=testenv dd.version=1.2.3 dd.trace_id="%d" dd.span_id="%d"`, span.TraceID, span.SpanID)
 		assert.Equal(expect, fmt.Sprintf("%v", span))
 	})
 
@@ -462,7 +462,7 @@ func TestSpanLog(t *testing.T) {
 		tracer, _, _, stop := startTestTracer(t)
 		defer stop()
 		span := tracer.StartSpan("test.request").(*span)
-		expect := fmt.Sprintf("dd.service=tracer.test dd.env=testenv dd.version=1.2.3 dd.trace_id=%d dd.span_id=%d", span.TraceID, span.SpanID)
+		expect := fmt.Sprintf(`dd.service=tracer.test dd.env=testenv dd.version=1.2.3 dd.trace_id="%d" dd.span_id="%d"`, span.TraceID, span.SpanID)
 		assert.Equal(expect, fmt.Sprintf("%v", span))
 	})
 
@@ -471,7 +471,7 @@ func TestSpanLog(t *testing.T) {
 		tracer, _, _, stop := startTestTracer(t, WithService("tracer.test"), WithServiceVersion("1.2.3"))
 		defer stop()
 		span := tracer.StartSpan("test.request").(*span)
-		expect := fmt.Sprintf("%%!b(ddtrace.Span=dd.service=tracer.test dd.version=1.2.3 dd.trace_id=%d dd.span_id=%d)", span.TraceID, span.SpanID)
+		expect := fmt.Sprintf(`%%!b(ddtrace.Span=dd.service=tracer.test dd.version=1.2.3 dd.trace_id="%d" dd.span_id="%d")`, span.TraceID, span.SpanID)
 		assert.Equal(expect, fmt.Sprintf("%b", span))
 	})
 
@@ -480,7 +480,7 @@ func TestSpanLog(t *testing.T) {
 		tracer, _, _, stop := startTestTracer(t, WithService("tracer.test"), WithServiceVersion("1.2.3"), WithEnv("testenv"))
 		span := tracer.StartSpan("test.request").(*span)
 		stop()
-		expect := fmt.Sprintf("dd.service=tracer.test dd.trace_id=%d dd.span_id=%d", span.TraceID, span.SpanID)
+		expect := fmt.Sprintf(`dd.service=tracer.test dd.trace_id="%d" dd.span_id="%d"`, span.TraceID, span.SpanID)
 		assert.Equal(expect, fmt.Sprintf("%v", span))
 	})
 
@@ -495,7 +495,7 @@ func TestSpanLog(t *testing.T) {
 		tracer, _, _, stop := startTestTracer(t)
 		span := tracer.StartSpan("test.request").(*span)
 		stop()
-		expect := fmt.Sprintf("dd.service=tracer.test dd.env=testenv dd.version=1.2.3 dd.trace_id=%d dd.span_id=%d", span.TraceID, span.SpanID)
+		expect := fmt.Sprintf(`dd.service=tracer.test dd.env=testenv dd.version=1.2.3 dd.trace_id="%d" dd.span_id="%d"`, span.TraceID, span.SpanID)
 		assert.Equal(expect, fmt.Sprintf("%v", span))
 	})
 }