diff --git a/cl_dll/health.cpp b/cl_dll/health.cpp
index 4b7e284..d52700d 100644
--- a/cl_dll/health.cpp
+++ b/cl_dll/health.cpp
@@ -18,9 +18,9 @@
 // implementation of CHudHealth class
 //
 
-#include "STDIO.H"
-#include "STDLIB.H"
-#include "MATH.H"
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
 
 #include "hud.h"
 #include "cl_util.h"
diff --git a/cl_dll/thewastes_hud.cpp b/cl_dll/thewastes_hud.cpp
index 58cabcc..31f8c48 100644
--- a/cl_dll/thewastes_hud.cpp
+++ b/cl_dll/thewastes_hud.cpp
@@ -14,9 +14,9 @@
 //
 // thewastes_hud.cpp
 //
-#include "STDIO.H"
-#include "STDLIB.H"
-#include "MATH.H"
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
 #include <string.h>
 
 #include "hud.h"
diff --git a/cl_dll/util.cpp b/cl_dll/util.cpp
index 9ccb0ed..f2bbb4e 100644
--- a/cl_dll/util.cpp
+++ b/cl_dll/util.cpp
@@ -18,9 +18,9 @@
 // implementation of class-less helper functions
 //
 
-#include "STDIO.H"
-#include "STDLIB.H"
-#include "MATH.H"
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
 
 #include "hud.h"
 #include "cl_util.h"
@@ -142,4 +142,4 @@ int GetLocalPlayerIndex()
 void CenterPrint( const char *string )
 {
 	gEngfuncs.pfnCenterPrint( string );
-}
\ No newline at end of file
+}
diff --git a/cl_dll/util_vector.h b/cl_dll/util_vector.h
index 1fc1518..3a6974d 100644
--- a/cl_dll/util_vector.h
+++ b/cl_dll/util_vector.h
@@ -17,9 +17,9 @@
 //
 
 // Misc C-runtime library headers
-#include "STDIO.H"
-#include "STDLIB.H"
-#include "MATH.H"
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
 
 // Header file containing definition of globalvars_t and entvars_t
 typedef int	func_t;					//