diff --git a/src/runner.ts b/src/runner.ts
index 3c17fe1af1fac365a57817e509ffc513557dfbc4..8e84edaea1f74175442628b9a9c4aabc33bf86d4 100644
--- a/src/runner.ts
+++ b/src/runner.ts
@@ -56,7 +56,7 @@ export class Runner {
 			};
 
 			let headerAsFlag = (path: string) =>
-				path === "" ? [] : ["-I", path.replace(" ", "\\ ")];
+				path === "" ? [] : ["-I", path.replace(/ /g, "\\ ")];
 
 			// Todo: allow customizable flags
 			let execute = new vscode.ProcessExecution(