diff --git a/buildroot/tests/BIGTREE_GTR_V1_0 b/buildroot/tests/BIGTREE_GTR_V1_0
index c9e15e9c2e671..f204379def69f 100755
--- a/buildroot/tests/BIGTREE_GTR_V1_0
+++ b/buildroot/tests/BIGTREE_GTR_V1_0
@@ -38,6 +38,7 @@ opt_set MOTHERBOARD BOARD_BTT_GTR_V1_0 SERIAL_PORT -1 \
         MPC_SENSOR_RESPONSIVENESS '{ 0.22f, 0.22f, 0.22f }' \
         MPC_AMBIENT_XFER_COEFF '{ 0.068f, 0.068f, 0.068f }' \
         MPC_AMBIENT_XFER_COEFF_FAN255 '{ 0.097f, 0.097f, 0.097f }'
+        FILAMENT_HEAT_CAPACITY_PERMM '{ 5.6e-3f, 3.6e-3f, 5.6e-3f }'
 opt_enable SWITCHING_TOOLHEAD TOOL_SENSOR MPCTEMP MPC_EDIT_MENU MPC_AUTOTUNE_MENU
 opt_disable PIDTEMP
 exec_test $1 $2 "BigTreeTech GTR | MPC | Switching Toolhead | Tool Sensors" "$3"