diff --git a/[priyesh]ChangeLog b/[priyesh]ChangeLog
index 29f1547a2..e46b5bead 100644
--- a/[priyesh]ChangeLog
+++ b/[priyesh]ChangeLog
@@ -1,8 +1,16 @@
 2020-08-12  Priyesh Kumar  <priyeshkkumar@gmail.com>
 
+    * src/base/ftdebug.c (ft_log_handler): Fix "-Wunused-parameter" warning.
+
+    * include/freetype/ftlogging.h ( FTLOGGING_H_ ): Added Include guard.
+
+    * src/*: Fixed format specifiers.
+
+    * [priyesh]ChangeLog: Fix typo.  
+
     Bug fix on Windows.
 
-    * include/freetype/internal/ftdebug.h: Store the name of current 
+    * include/freetype/internal/ftdebug.h (FT_LOG): Store the name of current 
     `FT_COMPONENT' and then pass it to the functions `ft_add_tag()' and 
     `ft_remove_tag()'
 
diff --git a/include/freetype/ftlogging.h b/include/freetype/ftlogging.h
index 256a21d40..21ffb4926 100644
--- a/include/freetype/ftlogging.h
+++ b/include/freetype/ftlogging.h
@@ -1,5 +1,9 @@
 #include FT_CONFIG_CONFIG_H
 
+#ifndef FTLOGGING_H_
+#define FTLOGGING_H_
+
+
 FT_BEGIN_HEADER
 
  /***************************************************************************
@@ -40,7 +44,9 @@ FT_BEGIN_HEADER
   FT_Set_Log_Handler( ft_custom_log_handler handler ); 
 
   FT_EXPORT( void )
-  FT_Set_Default_Log_Handler();
+  FT_Set_Default_Log_Handler( void );
   
 
 FT_END_HEADER
+
+#endif /* FTLOGGING_H_ */
diff --git a/src/base/ftdebug.c b/src/base/ftdebug.c
index 6f925b43c..67163228d 100644
--- a/src/base/ftdebug.c
+++ b/src/base/ftdebug.c
@@ -452,6 +452,7 @@ else
   ft_log_handler( const struct dlg_origin* origin, 
                               const char* string, void* data )
   {
+    ( void ) data;
      static unsigned int features ;
      if( ft_timestamp_flag && ft_component_flag && ft_have_newline_char )
       features = features_both;
diff --git a/src/psaux/cffdecode.c b/src/psaux/cffdecode.c
index 3d2da1e03..3f60abce1 100644
--- a/src/psaux/cffdecode.c
+++ b/src/psaux/cffdecode.c
@@ -2153,7 +2153,7 @@
                                       decoder->locals_bias );
 
 
-            FT_TRACE4(( " callsubr (idx %d, entering level %d)\n",
+            FT_TRACE4(( " callsubr (idx %d, entering level %ld)\n",
                         idx,
                         zone - decoder->zones + 1 ));
 
@@ -2197,7 +2197,7 @@
                                       decoder->globals_bias );
 
 
-            FT_TRACE4(( " callgsubr (idx %d, entering level %d)\n",
+            FT_TRACE4(( " callgsubr (idx %d, entering level %ld)\n",
                         idx,
                         zone - decoder->zones + 1 ));
 
@@ -2236,7 +2236,7 @@
           break;
 
         case cff_op_return:
-          FT_TRACE4(( " return (leaving level %d)\n",
+          FT_TRACE4(( " return (leaving level %ld)\n",
                       decoder->zone - decoder->zones ));
 
           if ( decoder->zone <= decoder->zones )
diff --git a/src/psaux/t1decode.c b/src/psaux/t1decode.c
index 2ed27ca19..f35f2440c 100644
--- a/src/psaux/t1decode.c
+++ b/src/psaux/t1decode.c
@@ -517,7 +517,7 @@
 #ifdef FT_DEBUG_LEVEL_TRACE
       if ( bol )
       {
-        FT_TRACE5(( " (%d)", decoder->top - decoder->stack ));
+        FT_TRACE5(( " (%ld)", decoder->top - decoder->stack ));
         bol = FALSE;
       }
 #endif
@@ -1162,7 +1162,7 @@
           if ( top - decoder->stack != num_args )
             FT_TRACE0(( "t1_decoder_parse_charstrings:"
                         " too much operands on the stack"
-                        " (seen %d, expected %d)\n",
+                        " (seen %ld, expected %d)\n",
                         top - decoder->stack, num_args ));
             break;
         }
@@ -1209,7 +1209,7 @@
             FT_TRACE4(( "BuildCharArray = [ " ));
 
             for ( i = 0; i < decoder->len_buildchar; i++ )
-              FT_TRACE4(( "%d ", decoder->buildchar[i] ));
+              FT_TRACE4(( "%ld ", decoder->buildchar[i] ));
 
             FT_TRACE4(( "]\n" ));
           }
diff --git a/src/truetype/ttinterp.c b/src/truetype/ttinterp.c
index 2c6fc0588..66eb80282 100644
--- a/src/truetype/ttinterp.c
+++ b/src/truetype/ttinterp.c
@@ -3781,7 +3781,7 @@
 
             if ( opcode_pointer[i] == opcode_size[i] )
             {
-              FT_TRACE6(( "sph: Function %d, opcode ptrn: %d, %s %s\n",
+              FT_TRACE6(( "sph: Function %d, opcode ptrn: %ld, %s %s\n",
                           i, n,
                           exc->face->root.family_name,
                           exc->face->root.style_name ));