diff --git a/Dockerfile.builder b/Dockerfile.builder
index bc90473f..2186c89d 100644
--- a/Dockerfile.builder
+++ b/Dockerfile.builder
@@ -6,6 +6,8 @@ ENV VVV  /opt/vlang
 ENV PATH /opt/vlang:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
 ENV VFLAGS -cc gcc
 
+RUN echo "$TARGETPLATFORM" && exit 1
+
 RUN mkdir -p /opt/vlang && \
   ln -s /opt/vlang/v /usr/bin/v && \
   apk --no-cache add \