diff --git a/Parser/pgenmain.c b/Parser/pgenmain.c
index fc27a2c..a4d4911 100644
--- a/Parser/pgenmain.c
+++ b/Parser/pgenmain.c
@@ -49,7 +49,7 @@ main(int argc, char **argv)
        graminit_h = argv[2];
        graminit_c = argv[3];
        g = getgrammar(filename);
-       fp = fopen(graminit_c, "w");
+       fp = fopen(graminit_c, "wb");
        if (fp == NULL) {
                perror(graminit_c);
                Py_Exit(1);
@@ -58,7 +58,7 @@ main(int argc, char **argv)
                printf("Writing %s ...\n", graminit_c);
        printgrammar(g, fp);
        fclose(fp);
-       fp = fopen(graminit_h, "w");
+       fp = fopen(graminit_h, "wb");
        if (fp == NULL) {
                perror(graminit_h);
                Py_Exit(1);
@@ -79,7 +79,7 @@ getgrammar(char *filename)
        grammar *g0, *g;
        perrdetail err;
        
-       fp = fopen(filename, "r");
+       fp = fopen(filename, "rb");
        if (fp == NULL) {
                perror(filename);
                Py_Exit(1);

I don't understand the issue. Those files *are* text files, and have 
CRLF on Windows as expected, like all other text files.

I think you should fix your build process, or your environment, or your 
diff utility, or whatever is causing you a problem -- but not pgen.