diff --git a/lib/promrelabel/relabel.go b/lib/promrelabel/relabel.go
index 38ab350c7..601a0297d 100644
--- a/lib/promrelabel/relabel.go
+++ b/lib/promrelabel/relabel.go
@@ -673,7 +673,7 @@ func SplitMetricNameToTokens(name string) []string {
 var nonAlphaNumChars = regexp.MustCompile(`[^a-zA-Z0-9]`)
 
 var labelNameSanitizer = bytesutil.NewFastStringTransformer(func(s string) string {
-	return unsupportedLabelNameChars.ReplaceAllString(s, "_")
+	return unsupportedLabelNameChars.ReplaceAllLiteralString(s, "_")
 })
 
 var unsupportedLabelNameChars = regexp.MustCompile(`[^a-zA-Z0-9_]`)
@@ -686,7 +686,7 @@ func SanitizeMetricName(value string) string {
 }
 
 var metricNameSanitizer = bytesutil.NewFastStringTransformer(func(s string) string {
-	return unsupportedMetricNameChars.ReplaceAllString(s, "_")
+	return unsupportedMetricNameChars.ReplaceAllLiteralString(s, "_")
 })
 
 var unsupportedMetricNameChars = regexp.MustCompile(`[^a-zA-Z0-9_:]`)
diff --git a/lib/promscrape/discoveryutils/utils.go b/lib/promscrape/discoveryutils/utils.go
index 91a290056..08e867284 100644
--- a/lib/promscrape/discoveryutils/utils.go
+++ b/lib/promscrape/discoveryutils/utils.go
@@ -20,7 +20,7 @@ func SanitizeLabelName(name string) string {
 }
 
 var labelNamesSanitizer = bytesutil.NewFastStringTransformer(func(s string) string {
-	return invalidLabelCharRE.ReplaceAllString(s, "_")
+	return invalidLabelCharRE.ReplaceAllLiteralString(s, "_")
 })
 
 var invalidLabelCharRE = regexp.MustCompile(`[^a-zA-Z0-9_]`)
diff --git a/lib/protoparser/datadogutils/datadogutils.go b/lib/protoparser/datadogutils/datadogutils.go
index 51cc79c07..d5c474727 100644
--- a/lib/protoparser/datadogutils/datadogutils.go
+++ b/lib/protoparser/datadogutils/datadogutils.go
@@ -44,9 +44,9 @@ func SanitizeName(name string) string {
 }
 
 var namesSanitizer = bytesutil.NewFastStringTransformer(func(s string) string {
-	s = unsupportedDatadogChars.ReplaceAllString(s, "_")
-	s = multiUnderscores.ReplaceAllString(s, "_")
-	s = underscoresWithDots.ReplaceAllString(s, ".")
+	s = unsupportedDatadogChars.ReplaceAllLiteralString(s, "_")
+	s = multiUnderscores.ReplaceAllLiteralString(s, "_")
+	s = underscoresWithDots.ReplaceAllLiteralString(s, ".")
 	return s
 })
 
diff --git a/lib/querytracer/tracer_test.go b/lib/querytracer/tracer_test.go
index d67336f91..b0e4c0973 100644
--- a/lib/querytracer/tracer_test.go
+++ b/lib/querytracer/tracer_test.go
@@ -221,7 +221,7 @@ func areEqualTracesSkipDuration(s1, s2 string) bool {
 }
 
 func zeroDurationsInTrace(s string) string {
-	return skipDurationRe.ReplaceAllString(s, " 0ms: ")
+	return skipDurationRe.ReplaceAllLiteralString(s, " 0ms: ")
 }
 
 var skipDurationRe = regexp.MustCompile(" [0-9.]+ms: ")
@@ -233,7 +233,7 @@ func areEqualJSONTracesSkipDuration(s1, s2 string) bool {
 }
 
 func zeroJSONDurationsInTrace(s string) string {
-	return skipJSONDurationRe.ReplaceAllString(s, `"duration_msec":0`)
+	return skipJSONDurationRe.ReplaceAllLiteralString(s, `"duration_msec":0`)
 }
 
 var skipJSONDurationRe = regexp.MustCompile(`"duration_msec":[0-9.]+`)