diff --git a/tcc.h b/tcc.h
index 8ef9ad28..13cd17e0 100644
--- a/tcc.h
+++ b/tcc.h
@@ -1509,7 +1509,7 @@ ST_DATA int func_bound_add_epilog;
 #define TCC_OUTPUT_FORMAT_COFF   2 /* COFF */
 #define TCC_OUTPUT_DYN           TCC_OUTPUT_DLL
 
-#define ARMAG  "!<arch>\012"    /* For COFF and a.out archives */
+#define ARMAG  "!<arch>\n"    /* For COFF and a.out archives */
 
 typedef struct {
     unsigned int n_strx;         /* index into string table of name */
diff --git a/tcctools.c b/tcctools.c
index ef4e14e0..606855bf 100644
--- a/tcctools.c
+++ b/tcctools.c
@@ -197,7 +197,7 @@ finish:
 
     funcmax = 250;
     afpos = tcc_realloc(NULL, funcmax * sizeof *afpos); // 250 func
-    memcpy(&arhdro.ar_mode, "100666", 6);
+    memcpy(&arhdro.ar_mode, "100644", 6);
 
     // i_obj = first input object file
     while (i_obj < argc)
@@ -302,7 +302,7 @@ finish:
     if ((hofs & 1)) // align
         hofs++, fpos = 1;
     // write header
-    fwrite("!<arch>\n", 8, 1, fh);
+    fwrite(ARMAG, 8, 1, fh);
     // create an empty archive
     if (!funccnt) {
         ret = 0;