diff --git a/Sources/Ecc/Main.h b/Sources/Ecc/Main.h
index 143bf05..5a7d34f 100644
--- a/Sources/Ecc/Main.h
+++ b/Sources/Ecc/Main.h
@@ -15,7 +15,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 
 
 /* rcg10042001 */
-#ifdef PLATFORM_WIN32
+#ifdef _WIN32
 #define alloca _alloca
 #endif
 
diff --git a/Sources/Ecc/StdH.h b/Sources/Ecc/StdH.h
index ea0cdca..606c882 100644
--- a/Sources/Ecc/StdH.h
+++ b/Sources/Ecc/StdH.h
@@ -21,11 +21,9 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include <stdarg.h>
 #include <math.h>
 
-#ifdef PLATFORM_WIN32
+#ifdef _WIN32
 #include <malloc.h>
-#endif
-
-#ifdef PLATFORM_UNIX
+#else
 #include <errno.h>
 #include <sys/param.h>
 #include <unistd.h>