diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7c5008ca1..0c7c62e13 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -179,19 +179,6 @@ if(LTO)
 	endif()
 endif()
 
-check_include_file("tgmath.h" HAVE_TGMATH_H)
-if(HAVE_TGMATH_H)
-	if(NOT MSVC)
-		set(CMAKE_REQUIRED_LIBRARIES "m")
-	endif()
-	check_c_source_compiles("#include <tgmath.h>
-	const float val = 2, val2 = 3;
-	int main(){ return (int)(-asin(val) + cos(val2)); }" HAVE_VALID_TGMATH_H )
-	if(${HAVE_VALID_TGMATH_H})
-		add_definitions(-DHAVE_TGMATH_H)
-	endif()
-endif()
-
 if(BUILD_CLIENT)
 	message(STATUS "Building client enabled")
 	add_subdirectory(cl_dll)
diff --git a/pm_shared/pm_debug.cpp b/pm_shared/pm_debug.cpp
index 096ce3d15..e07fed14d 100644
--- a/pm_shared/pm_debug.cpp
+++ b/pm_shared/pm_debug.cpp
@@ -12,11 +12,8 @@
 *   without written permission from Valve LLC.
 *
 ****/
-#include <math.h>
+#include <cmath>
 #include "mathlib.h"
-#if HAVE_TGMATH_H
-#include <tgmath.h>
-#endif
 
 #include "usercmd.h"
 #include "pm_defs.h"
@@ -24,8 +21,6 @@
 #include "pm_movevars.h"
 #include "pm_debug.h"
 
-#include <string.h>
-
 #if _MSC_VER
 #pragma warning(disable : 4244)
 #pragma warning(disable : 4305)
diff --git a/pm_shared/pm_math.cpp b/pm_shared/pm_math.cpp
index 9b88bccf5..b580b55ad 100644
--- a/pm_shared/pm_math.cpp
+++ b/pm_shared/pm_math.cpp
@@ -15,9 +15,6 @@
 // pm_math.c -- math primitives
 #include <cmath>
 #include "mathlib.h"
-#if HAVE_TGMATH_H
-#include <tgmath.h>
-#endif
 #include "const.h"
 
 // up / down