diff --git a/CHANGELOG.md b/CHANGELOG.md
index b6f9a151c31..7cdf500d1de 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -37,6 +37,7 @@
 - Automatically determine the RabbitMQ protocol when possible, and support setting the protocl via TriggerAuthentication ([#1459](https://github.com/kedacore/keda/pulls/1459),[#1483](https://github.com/kedacore/keda/pull/1483))
 - Improve performance when fetching pod information ([#1457](https://github.com/kedacore/keda/pull/1457))
 - Improve performance when fetching current scaling information on Deployments ([#1458](https://github.com/kedacore/keda/pull/1458))
+- Improve error reporting in prometheus scaler ([PR #1497](https://github.com/kedacore/keda/pull/1497))
 
 ### Breaking Changes
 
diff --git a/pkg/scalers/prometheus_scaler.go b/pkg/scalers/prometheus_scaler.go
index 92e31cad8be..b9b8ba53b65 100644
--- a/pkg/scalers/prometheus_scaler.go
+++ b/pkg/scalers/prometheus_scaler.go
@@ -149,6 +149,10 @@ func (s *prometheusScaler) ExecutePromQuery() (float64, error) {
 	}
 	r.Body.Close()
 
+	if !(r.StatusCode >= 200 && r.StatusCode <= 299) {
+		return -1, fmt.Errorf("prometheus query api returned error. status: %d response: %s", r.StatusCode, string(b))
+	}
+
 	var result promQueryResult
 	err = json.Unmarshal(b, &result)
 	if err != nil {