--- a/mercurial/sparse.py	Mon May 18 12:45:45 2020 -0400
+++ b/mercurial/sparse.py	Mon May 18 14:59:59 2020 -0400
@@ -18,6 +18,7 @@
     error,
     match as matchmod,
     merge as mergemod,
+    mergestate as mergestatemod,
     pathutil,
     pycompat,
     scmutil,
@@ -406,7 +407,7 @@
         elif file in wctx:
             prunedactions[file] = (b'r', args, msg)
 
-        if branchmerge and type == mergemod.ACTION_MERGE:
+        if branchmerge and type == mergestatemod.ACTION_MERGE:
             f1, f2, fa, move, anc = args
             if not sparsematch(f1):
                 temporaryfiles.append(f1)