diff --git a/src/ZmqLogger.cpp b/src/ZmqLogger.cpp
index 0be04bfaa..103de73d7 100644
--- a/src/ZmqLogger.cpp
+++ b/src/ZmqLogger.cpp
@@ -124,7 +124,7 @@ void ZmqLogger::Log(std::string message)
 	zmq::message_t reply (message.length());
 	std::memcpy (reply.data(), message.c_str(), message.length());
 
-#if ZMQ_VERSION >= ZMQ_MAKE_VERSION(4, 3, 1)
+#if ZMQ_VERSION > ZMQ_MAKE_VERSION(4, 3, 1)
 	// Set flags for immediate delivery (new API)
 	publisher->send(reply, zmq::send_flags::dontwait);
 #else
diff --git a/src/bindings/ruby/CMakeLists.txt b/src/bindings/ruby/CMakeLists.txt
index dc571a814..2faa10fce 100644
--- a/src/bindings/ruby/CMakeLists.txt
+++ b/src/bindings/ruby/CMakeLists.txt
@@ -41,6 +41,23 @@ if (NOT RUBY_FOUND)
   return()
 endif()
 
+### Ruby 2.7.0 made API changes that are incompatible with versions of
+### SWIG prior to 4.0.3
+option(SILENCE_RUBY_VERSION_WARNING
+  "Don't warn about possible SWIG incompatibilities with Ruby 2.7.0+" OFF)
+
+if (${RUBY_VERSION} VERSION_GREATER 2.6.9 AND ${SWIG_VERSION} VERSION_LESS 4.0.3)
+  if (NOT ${SILENCE_RUBY_VERSION_WARNING})
+    message(WARNING "
+Ruby 2.7.0+ detected, building the libopenshot Ruby API bindings \
+requires a pre-release version of SWIG 4.0.3 with this commit: \
+https://github.com/swig/swig/commit/5542cc228ad10bdc5c91107afb77c808c43bf2a4")
+    message(STATUS "
+To disable this warning, add -DSILENCE_RUBY_VERSION_WARNING:BOOL=1 to the cmake \
+command line, or enable the option in the CMake GUI.")
+  endif()
+endif()
+
 ### Include the Ruby header files
 include_directories(${RUBY_INCLUDE_DIRS})