diff --git a/src/bin/jp3d/convert.c b/src/bin/jp3d/convert.c
index 23fd70b0..acad8f82 100644
--- a/src/bin/jp3d/convert.c
+++ b/src/bin/jp3d/convert.c
@@ -297,8 +297,8 @@ opj_volume_t* pgxtovolume(char *relpath, opj_cparameters_t *parameters)
         fprintf(stdout, "[INFO] Loading %s \n", pgxfiles[pos]);
 
         fseek(f, 0, SEEK_SET);
-        fscanf(f, "PG%[ \t]%c%c%[ \t+-]%d%[ \t]%d%[ \t]%d", temp, &endian1, &endian2,
-               signtmp, &prec, temp, &w, temp, &h);
+        fscanf(f, "PG%31[ \t]%c%c%31[ \t+-]%d%31[ \t]%d%31[ \t]%d", temp, &endian1,
+               &endian2, signtmp, &prec, temp, &w, temp, &h);
 
         i = 0;
         sign = '+';
diff --git a/src/bin/jpwl/convert.c b/src/bin/jpwl/convert.c
index f3bb670b..73c1be72 100644
--- a/src/bin/jpwl/convert.c
+++ b/src/bin/jpwl/convert.c
@@ -1349,7 +1349,7 @@ opj_image_t* pgxtoimage(const char *filename, opj_cparameters_t *parameters)
     }
 
     fseek(f, 0, SEEK_SET);
-    if (fscanf(f, "PG%[ \t]%c%c%[ \t+-]%d%[ \t]%d%[ \t]%d", temp, &endian1,
+    if (fscanf(f, "PG%31[ \t]%c%c%31[ \t+-]%d%31[ \t]%d%31[ \t]%d", temp, &endian1,
                &endian2, signtmp, &prec, temp, &w, temp, &h) != 9) {
         fprintf(stderr,
                 "ERROR: Failed to read the right number of element from the fscanf() function!\n");