diff --git a/builder/osc/common/access_config_test.go b/builder/osc/common/access_config_test.go
index 3af491608..7e26ad73a 100644
--- a/builder/osc/common/access_config_test.go
+++ b/builder/osc/common/access_config_test.go
@@ -12,19 +12,25 @@ func TestAccessConfigPrepare_Region(t *testing.T) {
 	c := testAccessConfig()
 
 	c.RawRegion = "us-east-12"
-	err := c.ValidateRegion(c.RawRegion)
+	err := c.ValidateOSCRegion(c.RawRegion)
 	if err == nil {
 		t.Fatalf("should have region validation err: %s", c.RawRegion)
 	}
 
 	c.RawRegion = "us-east-1"
-	err = c.ValidateRegion(c.RawRegion)
+	err := c.ValidateOSCRegion(c.RawRegion)
+	if err == nil {
+		t.Fatalf("should have region validation err: %s", c.RawRegion)
+	}
+
+	c.RawRegion = "us-west-1"
+	err = c.ValidateOSCRegion(c.RawRegion)
 	if err != nil {
 		t.Fatalf("shouldn't have region validation err: %s", c.RawRegion)
 	}
 
 	c.RawRegion = "custom"
-	err = c.ValidateRegion(c.RawRegion)
+	err = c.ValidateOSCRegion(c.RawRegion)
 	if err == nil {
 		t.Fatalf("should have region validation err: %s", c.RawRegion)
 	}
diff --git a/builder/osc/common/regions.go b/builder/osc/common/regions.go
index 6f7e81d24..9b86acbae 100644
--- a/builder/osc/common/regions.go
+++ b/builder/osc/common/regions.go
@@ -28,7 +28,7 @@ func listOSCRegions(oscconn *osc.RegionApiService) ([]string, error) {
 
 // ValidateRegion returns true if the supplied region is a valid Outscale
 // region and false if it's not.
-func (c *AccessConfig) ValidateRegion(regions ...string) error {
+func (c *AccessConfig) ValidateOSCRegion(regions ...string) error {
 	oscconn := c.NewOSCClient()
 
 	validRegions, err := listOSCRegions(oscconn.RegionApi)