diff --git a/src/base/context.lua b/src/base/context.lua
index 0e1c662e32..fe0e80f1f8 100644
--- a/src/base/context.lua
+++ b/src/base/context.lua
@@ -137,8 +137,12 @@
 --
 
 	function context.mergeFilters(ctx, src)
-		for k,v in pairs(src.terms) do
-			ctx.terms[k] = v
+		for k, v in pairs(src.terms) do
+			if k == "tags" then
+				ctx.terms[k] = table.join(ctx.terms[k], v)
+			else
+				ctx.terms[k] = v
+			end
 		end
 	end
 
diff --git a/tests/base/test_context.lua b/tests/base/test_context.lua
index f04ee7ba6e..6e98ed42a0 100644
--- a/tests/base/test_context.lua
+++ b/tests/base/test_context.lua
@@ -73,3 +73,41 @@
 		-- detoken in extended context should result in value set in that environ.
 		test.isequal("text", ext.targetname)
 	end
+
+--
+-- mergeFilters should behave as expected for tags
+--
+
+	function suite.mergeFilters()
+
+		ctx = { terms = { tags = { "ctxtags" } } }
+		src = { terms = { tags = { "srctags" } } }
+
+		context.mergeFilters(ctx, src)
+
+		result = { terms = { tags = { "ctxtags", "srctags" } } }
+
+		test.isequal(result, ctx)
+	end
+
+	function suite.mergeFilters_keeptype()
+
+		ctx = { terms = { kind = "ConsoleApp" } }
+		src = { terms = { kind = "ConsoleApp" } }
+
+		context.mergeFilters(ctx, src)
+
+		test.isequal("string", type(ctx.terms.kind))
+	end
+
+	function suite.mergeFilters_createtable()
+
+		ctx = { terms = { tags = "ctxtags" } }
+		src = { terms = { tags = "srctags" } }
+
+		context.mergeFilters(ctx, src)
+
+		result = { terms = { tags = { "ctxtags", "srctags" } } }
+
+		test.isequal(result, ctx)
+	end