diff --git a/ChangeLog.txt b/ChangeLog.txt
index ac6aad33..bdb1708f 100644
--- a/ChangeLog.txt
+++ b/ChangeLog.txt
@@ -52,6 +52,14 @@ were not actually usable on any platform except OS X and Windows, because
 those functions were not included in the libturbojpeg mapfile.  This has been
 fixed.
 
+[11] Restored the JPP() and JMETHOD() macros in the libjpeg-turbo header files.
+libjpeg-turbo no longer supports compilers that don't support prototype
+parameters, so the JPP() and JMETHOD() macros are no longer needed, but some
+software packages still use them to define their own prototypes.  A pretty
+good argument can be made that this is a bad practice on the part of the
+software in question, but since this affects more than one package, it's just
+easier to fix it here.
+
 
 1.3.90 (1.4 beta1)
 ==================
diff --git a/jmorecfg.h b/jmorecfg.h
index 36fe9714..0ee8f502 100644
--- a/jmorecfg.h
+++ b/jmorecfg.h
@@ -180,6 +180,16 @@ typedef unsigned int JDIMENSION;
 #define EXTERN(type)            extern type
 
 
+/* Originally, this macro was used as a way of defining function prototypes
+ * for both modern compilers as well as older compilers that did not support
+ * prototype parameters.  libjpeg-turbo no longer supports these older
+ * compilers, but the macro is still included because there is some software
+ * out there that uses it.
+ */
+
+#define JMETHOD(type,methodname,arglist)  type (*methodname) arglist
+
+
 /*
  * On a few systems, type boolean and/or its values FALSE, TRUE may appear
  * in standard header files.  Or you may have conflicts with application-
diff --git a/jpeglib.h b/jpeglib.h
index 27045a42..b7089706 100644
--- a/jpeglib.h
+++ b/jpeglib.h
@@ -875,6 +875,16 @@ struct jpeg_memory_mgr {
 typedef boolean (*jpeg_marker_parser_method) (j_decompress_ptr cinfo);
 
 
+/* Originally, this macro was used as a way of defining function prototypes
+ * for both modern compilers as well as older compilers that did not support
+ * prototype parameters.  libjpeg-turbo no longer supports these older
+ * compilers, but the macro is still included because there is some software
+ * out there that uses it.
+ */
+
+#define JPP(arglist)    arglist
+
+
 /* Default error-management setup */
 EXTERN(struct jpeg_error_mgr *) jpeg_std_error (struct jpeg_error_mgr * err);