diff --git a/libtcc.c b/libtcc.c
index 4e69b4b..ec25978 100644
--- a/libtcc.c
+++ b/libtcc.c
@@ -1143,6 +1143,9 @@ LIBTCCAPI TCCState *tcc_new(void)
 # if defined(__NetBSD__)
     tcc_define_symbol(s, "__NetBSD__", "__NetBSD__");
 # endif
+# if defined(__OpenBSD__)
+    tcc_define_symbol(s, "__OpenBSD__", "__OpenBSD__");
+# endif
 
     /* TinyCC & gcc defines */
 #if defined(TCC_TARGET_PE) && defined(TCC_TARGET_X86_64)
@@ -1170,7 +1173,7 @@ LIBTCCAPI TCCState *tcc_new(void)
     /* wint_t is unsigned int by default, but (signed) int on BSDs
        and unsigned short on windows.  Other OSes might have still
        other conventions, sigh.  */
-#if defined(__FreeBSD__) || defined (__FreeBSD_kernel__) || defined(__NetBSD__)
+#if defined(__FreeBSD__) || defined (__FreeBSD_kernel__) || defined(__NetBSD__) || defined(__OpenBSD__)
     tcc_define_symbol(s, "__WINT_TYPE__", "int");
 #else
     tcc_define_symbol(s, "__WINT_TYPE__", "unsigned int");