diff --git a/loader/loader.go b/loader/loader.go
index 2fbbf50b..27666223 100644
--- a/loader/loader.go
+++ b/loader/loader.go
@@ -556,7 +556,7 @@ func loadServiceWithExtends(filename, name string, servicesDict map[string]inter
 				if vol.Type != types.VolumeTypeBind {
 					continue
 				}
-				baseService.Volumes[i].Source = absPath(baseFileParent, vol.Source)
+				baseService.Volumes[i].Source = resolveMaybeUnixPath(vol.Source, baseFileParent, lookupEnv)
 			}
 		}
 
diff --git a/loader/loader_test.go b/loader/loader_test.go
index f51c0e8a..8b57e3ed 100644
--- a/loader/loader_test.go
+++ b/loader/loader_test.go
@@ -1834,6 +1834,12 @@ func TestLoadWithExtends(t *testing.T) {
 			},
 			Environment: types.MappingWithEquals{},
 			Networks:    map[string]*types.ServiceNetworkConfig{"default": nil},
+			Volumes:     []types.ServiceVolumeConfig{{
+				Type:   "bind",
+				Source: "/opt/data",
+				Target: "/var/lib/mysql",
+				Bind:   &types.ServiceVolumeBind{CreateHostPath: true},
+			}},
 			Scale:       1,
 		},
 	}
diff --git a/loader/testdata/compose-test-extends-imported.yaml b/loader/testdata/compose-test-extends-imported.yaml
index 03f2ea20..c38f39f1 100644
--- a/loader/testdata/compose-test-extends-imported.yaml
+++ b/loader/testdata/compose-test-extends-imported.yaml
@@ -1,3 +1,5 @@
 services:
   imported:
     image: nginx
+    volumes:
+      - /opt/data:/var/lib/mysql