diff --git a/lib/bundler/definition.rb b/lib/bundler/definition.rb
index 325c9cdcf6..6ca0ed156a 100644
--- a/lib/bundler/definition.rb
+++ b/lib/bundler/definition.rb
@@ -152,7 +152,7 @@ module Bundler
         @gems_to_unlock = @explicit_unlocks.any? ? @explicit_unlocks : @dependencies.map(&:name)
       else
         eager_unlock = @explicit_unlocks.map {|name| Dependency.new(name, ">= 0") }
-        @gems_to_unlock = @locked_specs.for(eager_unlock, false, platforms).map(&:name).uniq
+        @gems_to_unlock = @locked_specs.for(eager_unlock, platforms).map(&:name).uniq
       end
 
       @dependency_changes = converge_dependencies
@@ -495,7 +495,7 @@ module Bundler
     def normalize_platforms
       @platforms = resolve.normalize_platforms!(current_dependencies, platforms)
 
-      @resolve = SpecSet.new(resolve.for(current_dependencies, false, @platforms))
+      @resolve = SpecSet.new(resolve.for(current_dependencies, @platforms))
     end
 
     def add_platform(platform)
@@ -620,7 +620,7 @@ module Bundler
     end
 
     def filter_specs(specs, deps)
-      SpecSet.new(specs).for(deps, false, platforms)
+      SpecSet.new(specs).for(deps, platforms)
     end
 
     def materialize(dependencies)
@@ -726,7 +726,7 @@ module Bundler
 
       @platforms = result.add_extra_platforms!(platforms) if should_add_extra_platforms?
 
-      SpecSet.new(result.for(dependencies, false, @platforms))
+      SpecSet.new(result.for(dependencies, @platforms))
     end
 
     def precompute_source_requirements_for_indirect_dependencies?
diff --git a/lib/bundler/spec_set.rb b/lib/bundler/spec_set.rb
index ea4720fe67..9661da2cce 100644
--- a/lib/bundler/spec_set.rb
+++ b/lib/bundler/spec_set.rb
@@ -11,7 +11,18 @@ module Bundler
       @specs = specs
     end
 
-    def for(dependencies, check = false, platforms = [nil])
+    def for(dependencies, platforms_or_legacy_check = [nil], legacy_platforms = [nil])
+      platforms = if [true, false].include?(platforms_or_legacy_check)
+        Bundler::SharedHelpers.major_deprecation 2,
+          "SpecSet#for received a `check` parameter, but that's no longer used and deprecated. " \
+          "SpecSet#for always implicitly performs validation. Please remove this parameter",
+          print_caller_location: true
+
+        legacy_platforms
+      else
+        platforms_or_legacy_check
+      end
+
       materialize_dependencies(dependencies, platforms)
 
       @materializations.flat_map(&:specs).uniq
@@ -117,7 +128,7 @@ module Bundler
       return false if @specs.empty?
 
       validation_set = self.class.new(@specs)
-      validation_set.for(deps, true, [platform])
+      validation_set.for(deps, [platform])
 
       validation_set.incomplete_specs.any?
     end