diff --git a/contrib/infback9/infback9.c b/contrib/infback9/infback9.c
index 05fb3e3..742a392 100644
--- a/contrib/infback9/infback9.c
+++ b/contrib/infback9/infback9.c
@@ -16,12 +16,8 @@
 
    window is a user-supplied window and output buffer that is 64K bytes.
  */
-int ZEXPORT inflateBack9Init_(strm, window, version, stream_size)
-z_stream FAR *strm;
-unsigned char FAR *window;
-const char *version;
-int stream_size;
-{
+int ZEXPORT inflateBack9Init_(z_stream FAR *strm, unsigned char FAR *window,
+                              const char *version, int stream_size) {
     struct inflate_state FAR *state;
 
     if (version == Z_NULL || version[0] != ZLIB_VERSION[0] ||
@@ -51,8 +47,7 @@
 #ifdef MAKEFIXED
 #include <stdio.h>
 
-void makefixed9(void)
-{
+void makefixed9(void) {
     unsigned sym, bits, low, size;
     code *next, *lenfix, *distfix;
     struct inflate_state state;
@@ -214,13 +209,8 @@
    inflateBack() can also return Z_STREAM_ERROR if the input parameters
    are not correct, i.e. strm is Z_NULL or the state was not initialized.
  */
-int ZEXPORT inflateBack9(strm, in, in_desc, out, out_desc)
-z_stream FAR *strm;
-in_func in;
-void FAR *in_desc;
-out_func out;
-void FAR *out_desc;
-{
+int ZEXPORT inflateBack9(z_stream FAR *strm, in_func in, void FAR *in_desc,
+                         out_func out, void FAR *out_desc) {
     struct inflate_state FAR *state;
     z_const unsigned char FAR *next;    /* next input */
     unsigned char FAR *put;     /* next output */
@@ -603,9 +593,7 @@
     return ret;
 }
 
-int ZEXPORT inflateBack9End(strm)
-z_stream FAR *strm;
-{
+int ZEXPORT inflateBack9End(z_stream FAR *strm) {
     if (strm == Z_NULL || strm->state == Z_NULL || strm->zfree == (free_func)0)
         return Z_STREAM_ERROR;
     ZFREE(strm, strm->state);
diff --git a/contrib/infback9/infback9.h b/contrib/infback9/infback9.h
index 1073c0a..8371b4e 100644
--- a/contrib/infback9/infback9.h
+++ b/contrib/infback9/infback9.h
@@ -20,14 +20,14 @@
 extern "C" {
 #endif
 
-ZEXTERN int ZEXPORT inflateBack9 OF((z_stream FAR *strm,
-                                    in_func in, void FAR *in_desc,
-                                    out_func out, void FAR *out_desc));
-ZEXTERN int ZEXPORT inflateBack9End OF((z_stream FAR *strm));
-ZEXTERN int ZEXPORT inflateBack9Init_ OF((z_stream FAR *strm,
-                                         unsigned char FAR *window,
-                                         const char *version,
-                                         int stream_size));
+ZEXTERN int ZEXPORT inflateBack9(z_stream FAR *strm,
+                                 in_func in, void FAR *in_desc,
+                                 out_func out, void FAR *out_desc);
+ZEXTERN int ZEXPORT inflateBack9End(z_stream FAR *strm);
+ZEXTERN int ZEXPORT inflateBack9Init_(z_stream FAR *strm,
+                                      unsigned char FAR *window,
+                                      const char *version,
+                                      int stream_size);
 #define inflateBack9Init(strm, window) \
         inflateBack9Init_((strm), (window), \
         ZLIB_VERSION, sizeof(z_stream))
diff --git a/contrib/infback9/inftree9.c b/contrib/infback9/inftree9.c
index 01a91f8..4faec86 100644
--- a/contrib/infback9/inftree9.c
+++ b/contrib/infback9/inftree9.c
@@ -29,14 +29,9 @@
    table index bits.  It will differ if the request is greater than the
    longest code or if it is less than the shortest code.
  */
-int inflate_table9(type, lens, codes, table, bits, work)
-codetype type;
-unsigned short FAR *lens;
-unsigned codes;
-code FAR * FAR *table;
-unsigned FAR *bits;
-unsigned short FAR *work;
-{
+int inflate_table9(codetype type, unsigned short FAR *lens, unsigned codes,
+                   code FAR * FAR *table, unsigned FAR *bits,
+                   unsigned short FAR *work) {
     unsigned len;               /* a code's length in bits */
     unsigned sym;               /* index of code symbols */
     unsigned min, max;          /* minimum and maximum code lengths */
diff --git a/contrib/infback9/inftree9.h b/contrib/infback9/inftree9.h
index 3b39497..2c1252f 100644
--- a/contrib/infback9/inftree9.h
+++ b/contrib/infback9/inftree9.h
@@ -56,6 +56,6 @@
     DISTS
 } codetype;
 
-extern int inflate_table9 OF((codetype type, unsigned short FAR *lens,
-                             unsigned codes, code FAR * FAR *table,
-                             unsigned FAR *bits, unsigned short FAR *work));
+extern int inflate_table9(codetype type, unsigned short FAR *lens,
+                          unsigned codes, code FAR * FAR *table,
+                          unsigned FAR *bits, unsigned short FAR *work);