diff --git a/internal/build/helm.go b/internal/build/helm.go
index d8208e27..35e51db5 100644
--- a/internal/build/helm.go
+++ b/internal/build/helm.go
@@ -619,7 +619,7 @@ func (h *Helm) buildFromHelmRepository(ctx context.Context, obj *sourcev1beta2.H
 	}
 
 	ref := chart.RemoteReference{Name: obj.Spec.Chart, Version: obj.Spec.Version}
-	path, chartCacheKey, err := h.cache.GetOrLock(normalizedURL, ref)
+	path, chartCacheKey, err := h.cache.GetOrLock(normalizedURL, ref.WithEscapedName())
 	if err != nil {
 		return err
 	}
diff --git a/internal/helm/chart/builder.go b/internal/helm/chart/builder.go
index 22eae41a..e77e75bb 100644
--- a/internal/helm/chart/builder.go
+++ b/internal/helm/chart/builder.go
@@ -19,6 +19,7 @@ package chart
 import (
 	"context"
 	"fmt"
+	"net/url"
 	"os"
 	"path/filepath"
 	"regexp"
@@ -75,6 +76,12 @@ type RemoteReference struct {
 	Version string
 }
 
+// WithEscapedName returns a new RemoteReference with the Name URL-escaped.
+func (r RemoteReference) WithEscapedName() RemoteReference {
+	r.Name = url.PathEscape(r.Name)
+	return r
+}
+
 // Validate returns an error if the RemoteReference does not have
 // a Name set.
 func (r RemoteReference) Validate() error {