diff --git a/m4/openssl.m4 b/m4/openssl.m4
index bf5ce9fc..5d91a789 100644
--- a/m4/openssl.m4
+++ b/m4/openssl.m4
@@ -28,4 +28,9 @@ AC_DEFUN(tinc_OPENSSL,
     [LIBS="$LIBS -lcrypto"],
     [AC_MSG_ERROR("OpenSSL libraries not found.")]
   )
+
+  AC_CHECK_LIB(dl, dlopen,
+    [LIBS="$LIBS -ldl"],
+    [AC_MSG_ERROR("OpenSSL depends on libdl.")]
+  )
 ])