diff --git a/source/blender/blenlib/BLI_string.h b/source/blender/blenlib/BLI_string.h
index 78b1d689781..dbd2deb7cb6 100644
--- a/source/blender/blenlib/BLI_string.h
+++ b/source/blender/blenlib/BLI_string.h
@@ -21,6 +21,9 @@
 /* Buffer size of maximum `uint64` plus commas and terminator. */
 #define BLI_STR_FORMAT_UINT64_GROUPED_SIZE 27
 
+/* Buffer size of maximum `int64` plus commas and terminator. */
+#define BLI_STR_FORMAT_INT64_GROUPED_SIZE 28
+
 /* Buffer size of maximum `int32` with commas and terminator. */
 #define BLI_STR_FORMAT_INT32_GROUPED_SIZE 15
 
@@ -301,6 +304,8 @@ size_t BLI_str_format_int_grouped(char dst[BLI_STR_FORMAT_INT32_GROUPED_SIZE], i
  */
 size_t BLI_str_format_uint64_grouped(char dst[BLI_STR_FORMAT_UINT64_GROUPED_SIZE], uint64_t num)
     ATTR_NONNULL(1);
+size_t BLI_str_format_int64_grouped(char dst[BLI_STR_FORMAT_INT64_GROUPED_SIZE], int64_t num)
+    ATTR_NONNULL(1);
 /**
  * Format a size in bytes using binary units.
  * 1000 -> 1 KB
diff --git a/source/blender/blenlib/intern/string.cc b/source/blender/blenlib/intern/string.cc
index 5b3af4adb86..18e8ab5152d 100644
--- a/source/blender/blenlib/intern/string.cc
+++ b/source/blender/blenlib/intern/string.cc
@@ -1192,6 +1192,18 @@ size_t BLI_str_format_uint64_grouped(char dst[BLI_STR_FORMAT_UINT64_GROUPED_SIZE
   return BLI_str_format_int_grouped_ex(src, dst, num_len);
 }
 
+size_t BLI_str_format_int64_grouped(char dst[BLI_STR_FORMAT_INT64_GROUPED_SIZE], int64_t num)
+{
+  const size_t dst_maxncpy = BLI_STR_FORMAT_INT64_GROUPED_SIZE;
+  BLI_string_debug_size(dst, dst_maxncpy);
+  UNUSED_VARS_NDEBUG(dst_maxncpy);
+
+  char src[BLI_STR_FORMAT_INT64_GROUPED_SIZE];
+  const int num_len = int(SNPRINTF(src, "%" PRId64 "", num));
+
+  return BLI_str_format_int_grouped_ex(src, dst, num_len);
+}
+
 void BLI_str_format_byte_unit(char dst[BLI_STR_FORMAT_INT64_BYTE_UNIT_SIZE],
                               long long int bytes,
                               const bool base_10)
diff --git a/source/blender/editors/space_spreadsheet/spreadsheet_layout.cc b/source/blender/editors/space_spreadsheet/spreadsheet_layout.cc
index 76ea78ed0c5..cc73737a126 100644
--- a/source/blender/editors/space_spreadsheet/spreadsheet_layout.cc
+++ b/source/blender/editors/space_spreadsheet/spreadsheet_layout.cc
@@ -390,7 +390,9 @@ class SpreadsheetLayoutDrawer : public SpreadsheetDrawer {
         break;
       }
       default: {
-        value_str = fmt::format(std::locale("en_US.UTF-8"), "{:L}", value);
+        char dst[BLI_STR_FORMAT_INT64_GROUPED_SIZE];
+        BLI_str_format_int64_grouped(dst, value);
+        value_str = dst;
         break;
       }
     }
@@ -408,8 +410,9 @@ class SpreadsheetLayoutDrawer : public SpreadsheetDrawer {
     UI_but_func_tooltip_set(
         but,
         [](bContext * /*C*/, void *argN, const StringRef /*tip*/) {
-          return fmt::format(
-              std::locale("en_US.UTF-8"), "{:L} {}", *((int64_t *)argN), TIP_("bytes"));
+          char dst[BLI_STR_FORMAT_INT64_GROUPED_SIZE];
+          BLI_str_format_int64_grouped(dst, *(int64_t *)argN);
+          return fmt::format("{} {}", dst, TIP_("bytes"));
         },
         MEM_dupallocN<int64_t>(__func__, value),
         MEM_freeN);
@@ -593,8 +596,9 @@ float ColumnValues::fit_column_values_width_px(const std::optional<int64_t> &max
                                                 max_sample_size,
                                                 data_.typed<int64_t>(),
                                                 [](const int64_t value) {
-                                                  return fmt::format(
-                                                      std::locale("en_US.UTF-8"), "{:L}", value);
+                                                  char dst[BLI_STR_FORMAT_INT64_GROUPED_SIZE];
+                                                  BLI_str_format_int64_grouped(dst, value);
+                                                  return std::string(dst);
                                                 });
     }
     case SPREADSHEET_VALUE_TYPE_FLOAT: {