diff --git a/3rdparty/asio/include/asio/buffer.hpp b/3rdparty/asio/include/asio/buffer.hpp
index 7d53ddec089..094353eb52d 100644
--- a/3rdparty/asio/include/asio/buffer.hpp
+++ b/3rdparty/asio/include/asio/buffer.hpp
@@ -706,7 +706,7 @@ public:
 
   void operator()()
   {
-    *iter_;
+    (void)*iter_;
   }
 
 private:
diff --git a/src/emu/rendlay.cpp b/src/emu/rendlay.cpp
index aa111f25e85..b6efcde5f08 100644
--- a/src/emu/rendlay.cpp
+++ b/src/emu/rendlay.cpp
@@ -205,7 +205,7 @@ private:
 					{
 						std::istringstream stream(m_text);
 						stream.imbue(f_portable_locale);
-						m_text.c_str();
+						(void)m_text.c_str();
 						if (m_text[0] == '$')
 						{
 							stream.get();
@@ -242,7 +242,7 @@ private:
 					{
 						std::istringstream stream(m_text);
 						stream.imbue(f_portable_locale);
-						m_text.c_str();
+						(void)m_text.c_str();
 						if (m_text[0] == '$')
 						{
 							stream.get();
@@ -302,7 +302,7 @@ private:
 					{
 						std::istringstream stream(m_text);
 						stream.imbue(f_portable_locale);
-						m_text.c_str();
+						(void)m_text.c_str();
 						if (m_text[0] == '$')
 						{
 							stream.get();