diff -ur gkrellm-2.3.5-orig/src/chart.c gkrellm-2.3.5/src/chart.c
--- gkrellm-2.3.5-orig/src/chart.c	2010-09-14 20:25:51.000000000 +0400
+++ gkrellm-2.3.5/src/chart.c	2012-10-19 03:38:55.861080847 +0400
@@ -413,7 +413,12 @@
 				yI += cd->data[x];
 				y = chartdata_ycoord(cp, cd, yI);
 				if (cd->data[x] > 0)
-					gdk_draw_line(cd->data_bitmap, _GK.bit1_GC, n, y1, n, y);
+					{
+					if (y == y1)
+						gdk_draw_point(cd->data_bitmap, _GK.bit1_GC, n, y1);
+					else
+						gdk_draw_line(cd->data_bitmap, _GK.bit1_GC, n, y1, n, y);
+					}
 				y1 = y;
 				}
 			else
@@ -423,7 +428,12 @@
 				yN += cd->data[x];
 				y = chartdata_ycoord(cp, cd, yN);
 				if (cd->data[x] > 0)
-					gdk_draw_line(cd->data_bitmap, _GK.bit1_GC, n, y0, n, y);
+					{
+					if (y == y0)
+						gdk_draw_point(cd->data_bitmap, _GK.bit1_GC, n, y0);
+					else
+						gdk_draw_line(cd->data_bitmap, _GK.bit1_GC, n, y0, n, y);
+					}
 				y0 = y;
 				}
 			}