diff --git a/CMakeLists.txt b/CMakeLists.txt
index 377af081..7eca8809 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -25,7 +25,6 @@ endif()
 
 option(SANITIZERS "Build with sanitizers enabled" OFF) # Ignored on MSVC
 option(MORE_WARNINGS "Turn on more warnings" OFF) # Ignored on MSVC
-option(TRACE_PARSER "Trace parser execution" OFF)
 
 if(MSVC)
   # MSVC's standard library triggers warning C5105,
@@ -88,7 +87,3 @@ if(CMAKE_BUILD_TYPE STREQUAL "Release")
     message(CHECK_FAIL "no")
   endif()
 endif()
-
-if(TRACE_PARSER)
-  target_compile_definitions(rgbasm PRIVATE -DYYDEBUG)
-endif()
diff --git a/src/asm/main.c b/src/asm/main.c
index 78daee87..8abe986a 100644
--- a/src/asm/main.c
+++ b/src/asm/main.c
@@ -52,10 +52,6 @@ char const *__asan_default_options(void) { return "detect_leaks=0"; }
 // Unfortunately, macOS still ships 2.3, which is from 2008...
 int yyparse(void);
 
-#if defined(YYDEBUG) && YYDEBUG
-extern int yydebug;
-#endif
-
 FILE * dependfile;
 bool generatedMissingIncludes;
 bool failedOnMissingInclude;
@@ -161,10 +157,6 @@ int main(int argc, char *argv[])
 
 	dependfile = NULL;
 
-#if defined(YYDEBUG) && YYDEBUG
-	yydebug = 1;
-#endif
-
 	// Perform some init for below
 	sym_Init(now);