diff --git a/WHATS_NEW_DM b/WHATS_NEW_DM
index c7185a7f0..a83aecadc 100644
--- a/WHATS_NEW_DM
+++ b/WHATS_NEW_DM
@@ -1,5 +1,6 @@
 Version 1.02.17 -
 ===================================
+  Use fixed-size fields in report interface.
 
 Version 1.02.16 - 25th January 2007
 ===================================
diff --git a/libdm/libdevmapper.h b/libdm/libdevmapper.h
index 5d766f665..7a1e4a152 100644
--- a/libdm/libdevmapper.h
+++ b/libdm/libdevmapper.h
@@ -657,11 +657,11 @@ struct dm_report_field;
 struct dm_report;
 struct dm_report_field_type {
 	uint32_t type;		/* object type id */
-	const char id[32];	/* string used to specify the field */
-	unsigned int offset;	/* byte offset in the object */
-	const char heading[32];	/* string printed in header */
-	int width;		/* default width */
 	uint32_t flags;		/* DM_REPORT_FIELD_* */
+	uint32_t offset;	/* byte offset in the object */
+	int32_t width;		/* default width */
+	const char id[32];	/* string used to specify the field */
+	const char heading[32];	/* string printed in header */
 	int (*report_fn)(struct dm_report *rh, struct dm_pool *mem,
 			 struct dm_report_field *field, const void *data,
 			 void *private);
diff --git a/libdm/libdm-report.c b/libdm/libdm-report.c
index 9e4002c08..ebdda8f05 100644
--- a/libdm/libdm-report.c
+++ b/libdm/libdm-report.c
@@ -60,7 +60,7 @@ struct field_properties {
 	struct list list;
 	uint32_t field_num;
 	uint32_t sort_posn;
-	unsigned width;
+	int32_t width;
 	const struct dm_report_object_type *type;
 	uint32_t flags;
 };
@@ -750,7 +750,7 @@ int dm_report_output(struct dm_report *rh)
 	struct dm_report_field *field;
 	const char *repstr;
 	char buf[4096];
-	unsigned width;
+	int32_t width;
 	uint32_t align;
 
 	if (list_empty(&rh->rows))