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diff --git a/src/read.cc b/src/read.cc
index 2d51696..91468fb 100644
--- a/src/read.cc
+++ b/src/read.cc
@@ -1544,7 +1544,7 @@ Grid height %ld disagrees with existing y-grid, which is %d high",
chop_into_data_words(inLine.getValue(), _word, &_nword, MAX_nword);
PUT_VAR("..words_in_dataline..", double(_nword));
if (end_of_data == eof_before_data || _nword == 0) {
- char msg[100];
+ char msg[200];
sprintf(msg, "\
`read grid data' encountered early blank-line or end-of-file while\n\
trying to read line %d of grid data.", row + 1);
diff --git a/src/set.cc b/src/set.cc
index c886afe..e35575d 100644
--- a/src/set.cc
+++ b/src/set.cc
@@ -1979,8 +1979,8 @@ set_image_rangeCmd()
if (word_is(3, "from") && word_is(4, "grid")) {
bool first = true;
double min_val, max_val;
- for (int j = 0; j < _num_ymatrix_data; j++) {
- for (int i = 0; i < _num_xmatrix_data; i++) {
+ for (unsigned int j = 0; j < _num_ymatrix_data; j++) {
+ for (unsigned int i = 0; i < _num_xmatrix_data; i++) {
double f = _f_xy(i, j);
if (!gr_missing(f)) {
if (first) {
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