diff --git a/src/emu/luaengine.c b/src/emu/luaengine.c
index 027d97313462e..25d3b25d7e7cd 100644
--- a/src/emu/luaengine.c
+++ b/src/emu/luaengine.c
@@ -130,7 +130,7 @@ lua_engine::hook::hook()
 	cb = -1;
 }
 
-#if (defined(__sun__) && defined(__svr4__)) || defined(__ANDROID__)
+#if (defined(__sun__) && defined(__svr4__)) || defined(__ANDROID__) || defined(__OpenBSD__)
 #undef _L
 #endif
 
diff --git a/src/emu/netlist/plists.h b/src/emu/netlist/plists.h
index 8f8987d414c3e..2165be5019644 100644
--- a/src/emu/netlist/plists.h
+++ b/src/emu/netlist/plists.h
@@ -199,7 +199,7 @@ class plinearlist_t
 // pnamedlist_t: a simple list
 // ----------------------------------------------------------------------------------------
 
-#if (defined(__sun__) && defined(__svr4__)) || defined(__ANDROID__)
+#if (defined(__sun__) && defined(__svr4__)) || defined(__ANDROID__) || defined(__OpenBSD__)
 #undef _C
 #endif