diff --git a/src/compose/ports.ts b/src/compose/ports.ts
index 8ed9c318..bf4cb396 100644
--- a/src/compose/ports.ts
+++ b/src/compose/ports.ts
@@ -139,6 +139,12 @@ export class PortMap {
 			}, []);
 	}
 
+	public static normaliseComposePorts(portMaps: PortMap[]): PortMap[] {
+		return _.sortBy(portMaps, p => {
+			return p.ports.internalStart;
+		});
+	}
+
 	private parsePortString(portStr: string): void {
 		const match = portStr.match(PORTS_REGEX);
 		if (match == null) {
diff --git a/src/compose/service.ts b/src/compose/service.ts
index 44c856bb..c2613957 100644
--- a/src/compose/service.ts
+++ b/src/compose/service.ts
@@ -253,7 +253,9 @@ export class Service {
 
 		let portMaps: PortMap[] = [];
 		if (config.ports != null) {
-			portMaps = _.map(config.ports, p => new PortMap(p));
+			portMaps = PortMap.normaliseComposePorts(
+				_.map(config.ports, p => new PortMap(p)),
+			);
 		}
 		delete config.ports;