diff --git a/plug-ins/file-psd/psd.h b/plug-ins/file-psd/psd.h
index 724609dd09..b470686ef8 100644
--- a/plug-ins/file-psd/psd.h
+++ b/plug-ins/file-psd/psd.h
@@ -627,8 +627,8 @@ typedef struct
   gchar         type[4];                /* Image resource type */
   gint16        id;                     /* Image resource ID */
   gchar         name[256];              /* Image resource name (pascal string) */
-  gint32        data_start;             /* Image resource data start */
-  gint32        data_len;               /* Image resource data length */
+  guint32       data_start;             /* Image resource data start */
+  guint32       data_len;               /* Image resource data length */
 } PSDimageres;
 
 /* PSD Layer Resource data structure */
@@ -636,8 +636,8 @@ typedef struct
 {
   gchar         sig[4];                 /* Layer resource signature */
   gchar         key[4];                 /* Layer resource key */
-  gint32        data_start;             /* Layer resource data start */
-  gint32        data_len;               /* Layer resource data length */
+  guint32       data_start;             /* Layer resource data start */
+  guint32       data_len;               /* Layer resource data length */
 } PSDlayerres;
 
 /* PSD File data structures */