diff --git a/src/libslic3r/GCode.cpp b/src/libslic3r/GCode.cpp
index 8f68631cab..23ab2a5849 100644
--- a/src/libslic3r/GCode.cpp
+++ b/src/libslic3r/GCode.cpp
@@ -5402,7 +5402,7 @@ void GCode::append_full_config(const Print &print, std::string &str)
                 size_t temp_begin_t = idx * matrix_value_count, temp_end_t = (idx + 1) * matrix_value_count;
                 std::transform(temp_flush_volumes_matrix.begin() + temp_begin_t, temp_flush_volumes_matrix.begin() + temp_end_t,
                                temp_flush_volumes_matrix.begin() + temp_begin_t,
-                               [temp_cfg_flush_multiplier_idx](double inputx) { return inputx * temp_cfg_flush_multiplier_idx; });
+                               [temp_cfg_flush_multiplier_idx](double inputx) { return std::round(inputx * temp_cfg_flush_multiplier_idx); });
             }
             cfg.option<ConfigOptionFloats>("flush_volumes_matrix")->values = temp_flush_volumes_matrix;
         } else if (filament_count_tmp == 1) {