diff --git a/projects/libcoap/build.sh b/projects/libcoap/build.sh
index 1c9887334..1871b467f 100755
--- a/projects/libcoap/build.sh
+++ b/projects/libcoap/build.sh
@@ -16,6 +16,7 @@
 ################################################################################
 
 ./autogen.sh && ./configure --disable-doxygen --disable-manpages \
+                            --disable-dtls                       \
     && make -j$(nproc)
 
 # build all fuzzer targets