diff --git a/api/api.go b/api/api.go
index c0eb6671..eb995ad4 100644
--- a/api/api.go
+++ b/api/api.go
@@ -35,7 +35,7 @@ import (
 const (
 	httpServerShutdownTimeout = 10 * time.Second
 
-	// A read sample limit is already implemented dynamically with the header X-PromQL-Max-Evaluated-Points.
+	// A read sample limit is already implemented dynamically with the header X-SquirrelDB-Max-Evaluated-Points.
 	remoteReadSampleLimit     = 0       // No limit
 	remoteReadMaxBytesInFrame = 1048576 // 1 MiB (Prometheus default)
 )
diff --git a/api/promql/queryable.go b/api/promql/queryable.go
index e0d2ed2b..16bfceff 100644
--- a/api/promql/queryable.go
+++ b/api/promql/queryable.go
@@ -92,10 +92,6 @@ func (s Store) newQuerierFromHeaders(ctx context.Context, mint, maxt int64) (que
 	}
 
 	value := r.Header.Get(types.HeaderForcedMatcher)
-	if value == "" {
-		value = r.Header.Get(types.HeaderForcedMatcherOld)
-	}
-
 	if value != "" {
 		part := strings.SplitN(value, "=", 2)
 		if len(part) != 2 {
@@ -128,10 +124,6 @@ func (s Store) newQuerierFromHeaders(ctx context.Context, mint, maxt int64) (que
 	maxEvaluatedSeries := s.DefaultMaxEvaluatedSeries
 
 	maxEvaluatedSeriesText := r.Header.Get(types.HeaderMaxEvaluatedSeries)
-	if maxEvaluatedSeriesText == "" {
-		maxEvaluatedSeriesText = r.Header.Get(types.HeaderMaxEvaluatedSeriesOld)
-	}
-
 	if maxEvaluatedSeriesText != "" {
 		tmp, err := strconv.ParseUint(maxEvaluatedSeriesText, 10, 32)
 		if err != nil {
@@ -149,10 +141,6 @@ func (s Store) newQuerierFromHeaders(ctx context.Context, mint, maxt int64) (que
 	maxEvaluatedPoints := s.DefaultMaxEvaluatedPoints
 
 	maxEvaluatedPointsText := r.Header.Get(types.HeaderMaxEvaluatedPoints)
-	if maxEvaluatedPointsText == "" {
-		maxEvaluatedPointsText = r.Header.Get(types.HeaderMaxEvaluatedPointsOld)
-	}
-
 	if maxEvaluatedPointsText != "" {
 		tmp, err := strconv.ParseUint(maxEvaluatedPointsText, 10, 64)
 		if err != nil {
@@ -177,10 +165,6 @@ func (s Store) newQuerierFromHeaders(ctx context.Context, mint, maxt int64) (que
 	}
 
 	value = r.Header.Get(types.HeaderForcePreAggregated)
-	if value == "" {
-		value = r.Header.Get(types.HeaderForcePreAggregatedOld)
-	}
-
 	if value != "" {
 		tmp, err := strconv.ParseBool(value)
 		if err != nil {
@@ -191,10 +175,6 @@ func (s Store) newQuerierFromHeaders(ctx context.Context, mint, maxt int64) (que
 	}
 
 	value = r.Header.Get(types.HeaderForceRaw)
-	if value == "" {
-		value = r.Header.Get(types.HeaderForceRawOld)
-	}
-
 	if value != "" {
 		tmp, err := strconv.ParseBool(value)
 		if err != nil {
diff --git a/types/types.go b/types/types.go
index 3ddb1f36..e7569d3a 100644
--- a/types/types.go
+++ b/types/types.go
@@ -134,25 +134,20 @@ func WrapContext(ctx context.Context, r *http.Request) context.Context {
 // HTTP headers available to dynamically change settings on PromQL and remote read.
 const (
 	// Add one matcher to limit the evaluated series.
-	HeaderForcedMatcher    = "X-SquirrelDB-Forced-Matcher"
-	HeaderForcedMatcherOld = "X-PromQL-Forced-Matcher"
+	HeaderForcedMatcher = "X-SquirrelDB-Forced-Matcher"
 	// Limit the number of series that can be evaluated by a request.
 	// A limit of 0 means unlimited.
-	HeaderMaxEvaluatedSeries    = "X-SquirrelDB-Max-Evaluated-Series"
-	HeaderMaxEvaluatedSeriesOld = "X-PromQL-Max-Evaluated-Series"
+	HeaderMaxEvaluatedSeries = "X-SquirrelDB-Max-Evaluated-Series"
 	// Limit the number of points that can be evaluated by a request.
 	// A limit of 0 means unlimited.
-	HeaderMaxEvaluatedPoints    = "X-SquirrelDB-Max-Evaluated-Points"
-	HeaderMaxEvaluatedPointsOld = "X-PromQL-Max-Evaluated-Points"
+	HeaderMaxEvaluatedPoints = "X-SquirrelDB-Max-Evaluated-Points"
 	// Force using pre-aggregated data instead of raw points. Default for
 	// query is raw data. Default for query_range depends on step value.
-	HeaderForcePreAggregated    = "X-SquirrelDB-ForcePreAggregated"
-	HeaderForcePreAggregatedOld = "X-PromQL-ForcePreAggregated"
+	HeaderForcePreAggregated = "X-SquirrelDB-ForcePreAggregated"
 	// Force using raw data instead of pre-aggregated points. If both ForcePreAggregated
 	// and ForceRaw are true, ForceRaw has priority. Default for query is raw data.
 	// Default for query_range depends on step value.
-	HeaderForceRaw    = "X-SquirrelDB-ForceRaw"
-	HeaderForceRawOld = "X-PromQL-ForceRaw"
+	HeaderForceRaw = "X-SquirrelDB-ForceRaw"
 	// Only match metrics from this tenant. Metrics written with this header
 	// are associated to this tenant (a tenant label is added to the metric labels).
 	HeaderTenant = "X-SquirrelDB-Tenant"