diff --git a/src/lib/aqdiagram/graph/w_graph.c b/src/lib/aqdiagram/graph/w_graph.c
index 1a89b07..3bde84d 100644
--- a/src/lib/aqdiagram/graph/w_graph.c
+++ b/src/lib/aqdiagram/graph/w_graph.c
@@ -513,8 +513,8 @@ void AQDG_GraphWidget_SetupDefaultPens(AQDG_OBJECT *o)
     MKPEN(AQDG_GRAPHWIDGET_PEN_IDX_TICKMAINLEVEL,      AQDG_GRAPHWIDGET_COL_BLACK,      1, AQDG_Dash_None);
     MKPEN(AQDG_GRAPHWIDGET_PEN_IDX_TICKSUBLEVEL,       AQDG_GRAPHWIDGET_COL_BLACK,      1, AQDG_Dash_None);
     MKPEN(AQDG_GRAPHWIDGET_PEN_IDX_GRAPHBACKGROUND,    AQDG_GRAPHWIDGET_COL_WHITESMOKE, 1, AQDG_Dash_None);
-    MKPEN(AQDG_GRAPHWIDGET_PEN_IDX_GRID1,              AQDG_GRAPHWIDGET_COL_BLACK,      1, AQDG_Dash_Format1);
-    MKPEN(AQDG_GRAPHWIDGET_PEN_IDX_GRID2,              AQDG_GRAPHWIDGET_COL_BLACK,      1, AQDG_Dash_Format2);
+    MKPEN(AQDG_GRAPHWIDGET_PEN_IDX_GRID1,              AQDG_GRAPHWIDGET_COL_GRAY,       1, AQDG_Dash_Format1);
+    MKPEN(AQDG_GRAPHWIDGET_PEN_IDX_GRID2,              AQDG_GRAPHWIDGET_COL_GRAY,       1, AQDG_Dash_Format2);
     MKPEN(AQDG_GRAPHWIDGET_PEN_IDX_BACKGROUND,         AQDG_GRAPHWIDGET_COL_GAINSBORO,  1, AQDG_Dash_None);
     MKPEN(AQDG_GRAPHWIDGET_PEN_IDX_CURVE0,             AQDG_GRAPHWIDGET_COL_GREEN,      2, AQDG_Dash_None);
     MKPEN(AQDG_GRAPHWIDGET_PEN_IDX_CURVE1,             AQDG_GRAPHWIDGET_COL_BLUE,       2, AQDG_Dash_None);