diff --git a/Modules/_ctypes/libffi/src/x86/ffi.c b/Modules/_ctypes/libffi/src/x86/ffi.c
index cc63b6b..4d92029 100644
--- a/Modules/_ctypes/libffi/src/x86/ffi.c
+++ b/Modules/_ctypes/libffi/src/x86/ffi.c
@@ -256,7 +256,7 @@
      void **respp;
      void *args;
 {
-  // our various things...
+  /* our various things... */
   ffi_cif       *cif;
   void         **arg_area;
 
diff --git a/Modules/_ssl.c b/Modules/_ssl.c
index 7ab2297..58b04a6 100644
--- a/Modules/_ssl.c
+++ b/Modules/_ssl.c
@@ -656,7 +656,7 @@
 	char buf[2048];
 	char *vptr;
 	int len;
-	unsigned char *p;
+	const unsigned char *p;
 
 	if (certificate == NULL)
 		return peer_alt_names;
diff --git a/Modules/bsddb.h b/Modules/bsddb.h
index 36bed55..65c2bea 100644
--- a/Modules/bsddb.h
+++ b/Modules/bsddb.h
@@ -232,7 +232,7 @@
 #define DBSequenceObject_Check(v)  ((v)->ob_type == bsddb_api->dbsequence_type)
 #endif
 
-#endif // COMPILING_BSDDB_C
+#endif /* COMPILING_BSDDB_C */
 
 
-#endif // _BSDDB_H_
+#endif /* _BSDDB_H_ */
diff --git a/Modules/cjkcodecs/_codecs_iso2022.c b/Modules/cjkcodecs/_codecs_iso2022.c
index 55196a9..9ce7b75 100644
--- a/Modules/cjkcodecs/_codecs_iso2022.c
+++ b/Modules/cjkcodecs/_codecs_iso2022.c
@@ -203,7 +203,7 @@
 				} else
 					encoded = dsg->encoder(&c, &length);
 #else
-				encoded = dsg->encoder(*inbuf, &length);
+				encoded = dsg->encoder(&c, &length);
 #endif
 				if (encoded != MAP_UNMAPPABLE) {
 					insize = length;