--- a/make/Docs.gmk	Fri Mar 01 11:57:43 2019 +0100
+++ b/make/Docs.gmk	Fri Mar 01 12:12:01 2019 +0100
@@ -196,7 +196,7 @@
 
     # For each module needing a graph, create a png file from the dot file
     # generated by the GenGraphs tool and store it in the target dir.
-    $$(eval $$(call SetupExecute, gengraphs_png_$1, \
+    $$(eval $$(call SetupExecute, gengraphs_png_$1_$2, \
         INFO := Running dot for module graphs for $2, \
         DEPS := $$(gengraphs_$1_TARGET), \
         OUTPUT_FILE := $$($1_$2_PNG_TARGET), \