diff --git a/lib/fort.c b/lib/fort.c
index 3e130f2..3e80136 100644
--- a/lib/fort.c
+++ b/lib/fort.c
@@ -2832,9 +2832,10 @@ size_t ft_row_count(const ft_table_t *table)
 size_t ft_col_count(const ft_table_t *table)
 {
     assert(table && table->rows);
+    size_t i = 0;
     size_t cols_n = 0;
     size_t rows_n = vector_size(table->rows);
-    for (size_t i = 0; i < rows_n; ++i) {
+    for (i = 0; i < rows_n; ++i) {
         f_row_t *row = VECTOR_AT(table->rows, i, f_row_t *);
         size_t ncols = columns_in_row(row);
         cols_n = MAX(cols_n, ncols);
diff --git a/src/fort_impl.c b/src/fort_impl.c
index 065e891..ce364ca 100644
--- a/src/fort_impl.c
+++ b/src/fort_impl.c
@@ -236,9 +236,10 @@ size_t ft_row_count(const ft_table_t *table)
 size_t ft_col_count(const ft_table_t *table)
 {
     assert(table && table->rows);
+    size_t i = 0;
     size_t cols_n = 0;
     size_t rows_n = vector_size(table->rows);
-    for (size_t i = 0; i < rows_n; ++i) {
+    for (i = 0; i < rows_n; ++i) {
         f_row_t *row = VECTOR_AT(table->rows, i, f_row_t *);
         size_t ncols = columns_in_row(row);
         cols_n = MAX(cols_n, ncols);