diff --git a/boring-nginx/Dockerfile b/boring-nginx/Dockerfile
index 3b2b923..237e93e 100644
--- a/boring-nginx/Dockerfile
+++ b/boring-nginx/Dockerfile
@@ -62,8 +62,8 @@ RUN echo "@commuedge https://nl.alpinelinux.org/alpine/edge/community" >> /etc/a
  && cd /tmp && git clone https://github.com/openresty/headers-more-nginx-module --depth=1 \
  && git clone https://boringssl.googlesource.com/boringssl --depth=1 \
  && cd boringssl \
- && sed -i 's@out \([>=]\) TLS1_2_VERSION@out \1 TLS1_3_VERSION@' ssl/ssl_lib.c \
- && sed -i 's@ssl->version[ ]*=[ ]*TLS1_2_VERSION@ssl->version = TLS1_3_VERSION@' ssl/s3_lib.c \
+ && sed -i 's@out \([>=]\) TLS1_2_VERSION@out \1 TLS1_3_VERSION@' ssl/ssl_lib.cc \
+ && sed -i 's@ssl->version[ ]*=[ ]*TLS1_2_VERSION@ssl->version = TLS1_3_VERSION@' ssl/s3_lib.cc \
  && sed -i 's@(SSL3_VERSION, TLS1_2_VERSION@(SSL3_VERSION, TLS1_3_VERSION@' ssl/ssl_test.cc \
  && sed -i 's@\$shaext[ ]*=[ ]*0;@\$shaext = 1;@' crypto/*/asm/*.pl \
  && sed -i 's@\$avx[ ]*=[ ]*[0|1];@\$avx = 2;@' crypto/*/asm/*.pl \