diff --git a/src/main/java/fi/flexplex/lib/GraphQLApi.java b/src/main/java/fi/flexplex/lib/GraphQLApi.java
index 2913dac..8a469ca 100644
--- a/src/main/java/fi/flexplex/lib/GraphQLApi.java
+++ b/src/main/java/fi/flexplex/lib/GraphQLApi.java
@@ -28,7 +28,7 @@ public final class GraphQLApi {
 	protected Optional<JsonObject> execute(final String query) {
 		final HttpResponse<String> response;
 		final HttpRequest request = HttpRequest.newBuilder()
-			.POST(HttpRequest.BodyPublishers.ofString("{\"query\":\"" + query + "\"}"))
+			.POST(HttpRequest.BodyPublishers.ofString("{\"query\":\"" + query.replace("\"", "\\\"") + "\"}"))
 			.uri(this.uri)
 			.build();