diff --git a/WHATS_NEW b/WHATS_NEW
index 8bc9487d2..474b9208c 100644
--- a/WHATS_NEW
+++ b/WHATS_NEW
@@ -1,5 +1,6 @@
 Version 2.02.25 -
 =================================
+  Fix warnings on x86_64 involving ptrdiff_t in log_error messages
   Update pvck to include text metadata area and record detection
   Add support functions for analysis of config sections
   Update pvck to read labels on disk, with --labelsector parameter
diff --git a/lib/config/config.c b/lib/config/config.c
index fdfc3b5ef..9c7e86631 100644
--- a/lib/config/config.c
+++ b/lib/config/config.c
@@ -83,7 +83,8 @@ static const int sep = '/';
 
 #define match(t) do {\
    if (!_match_aux(p, (t))) {\
-	log_error("Parse error at byte %d (line %d): unexpected token", p->tb - p->fb + 1, p->line); \
+	log_error("Parse error at byte %" PRIptrdiff_t " (line %d): unexpected token", \
+		  p->tb - p->fb + 1, p->line); \
       return 0;\
    } \
 } while(0);
@@ -590,7 +591,8 @@ static struct config_value *_type(struct parser *p)
 		break;
 
 	default:
-		log_error("Parse error at byte %d (line %d): expected a value", p->tb - p->fb + 1, p->line);
+		log_error("Parse error at byte %" PRIptrdiff_t " (line %d): expected a value",
+			  p->tb - p->fb + 1, p->line);
 		return 0;
 	}
 	return v;
diff --git a/lib/datastruct/lvm-types.h b/lib/datastruct/lvm-types.h
index 3d35ca6e5..1d1de69cd 100644
--- a/lib/datastruct/lvm-types.h
+++ b/lib/datastruct/lvm-types.h
@@ -23,6 +23,7 @@
 
 /* Define some portable printing types */
 #define PRIsize_t "zu"
+#define PRIptrdiff_t "td"
 
 struct str_list {
 	struct list list;