diff --git a/lib/bundler/definition.rb b/lib/bundler/definition.rb
index 66efd82b53552d..8bd9e11f32bfb2 100644
--- a/lib/bundler/definition.rb
+++ b/lib/bundler/definition.rb
@@ -484,15 +484,13 @@ def unlocking?
     def resolver
       @resolver ||= begin
         last_resolve = converge_locked_specs
+        remove_ruby_from_platforms_if_necessary!(dependencies)
         Resolver.new(source_requirements, last_resolve, gem_version_promoter, additional_base_requirements_for_resolve, platforms)
       end
     end
 
     def expanded_dependencies
-      @expanded_dependencies ||= begin
-        remove_ruby_from_platforms_if_necessary!(dependencies)
-        expand_dependencies(dependencies + metadata_dependencies, true)
-      end
+      @expanded_dependencies ||= expand_dependencies(dependencies + metadata_dependencies, true)
     end
 
     def filter_specs(specs, deps)
@@ -896,7 +894,6 @@ def remove_ruby_from_platforms_if_necessary!(dependencies)
 
       remove_platform(Gem::Platform::RUBY)
       add_current_platform
-      resolver.platforms = @platforms
     end
 
     def source_map
diff --git a/lib/bundler/resolver.rb b/lib/bundler/resolver.rb
index e382319112fc08..a74af45027f935 100644
--- a/lib/bundler/resolver.rb
+++ b/lib/bundler/resolver.rb
@@ -7,8 +7,6 @@ class Resolver
 
     include GemHelpers
 
-    attr_writer :platforms
-
     # Figures out the best possible configuration of gems that satisfies
     # the list of passed dependencies and any child dependencies without
     # causing any gem activation errors.
diff --git a/spec/bundler/install/gemfile/specific_platform_spec.rb b/spec/bundler/install/gemfile/specific_platform_spec.rb
index bb5526203fc376..094186e63d7ea0 100644
--- a/spec/bundler/install/gemfile/specific_platform_spec.rb
+++ b/spec/bundler/install/gemfile/specific_platform_spec.rb
@@ -445,6 +445,77 @@
     L
   end
 
+  it "automatically fixes the lockfile if only RUBY platform is locked and some gem has no RUBY variant available" do
+    build_repo4 do
+      build_gem("sorbet-static-and-runtime", "0.5.10160") do |s|
+        s.add_runtime_dependency "sorbet", "= 0.5.10160"
+        s.add_runtime_dependency "sorbet-runtime", "= 0.5.10160"
+      end
+
+      build_gem("sorbet", "0.5.10160") do |s|
+        s.add_runtime_dependency "sorbet-static", "= 0.5.10160"
+      end
+
+      build_gem("sorbet-runtime", "0.5.10160")
+
+      build_gem("sorbet-static", "0.5.10160") do |s|
+        s.platform = Gem::Platform.local
+      end
+    end
+
+    gemfile <<~G
+      source "#{file_uri_for(gem_repo4)}"
+
+      gem "sorbet-static-and-runtime"
+    G
+
+    lockfile <<~L
+      GEM
+        remote: #{file_uri_for(gem_repo4)}/
+        specs:
+          sorbet (0.5.10160)
+            sorbet-static (= 0.5.10160)
+          sorbet-runtime (0.5.10160)
+          sorbet-static (0.5.10160-#{Gem::Platform.local})
+          sorbet-static-and-runtime (0.5.10160)
+            sorbet (= 0.5.10160)
+            sorbet-runtime (= 0.5.10160)
+
+      PLATFORMS
+        ruby
+
+      DEPENDENCIES
+        sorbet-static-and-runtime
+
+      BUNDLED WITH
+         #{Bundler::VERSION}
+    L
+
+    bundle "update"
+
+    expect(lockfile).to eq <<~L
+      GEM
+        remote: #{file_uri_for(gem_repo4)}/
+        specs:
+          sorbet (0.5.10160)
+            sorbet-static (= 0.5.10160)
+          sorbet-runtime (0.5.10160)
+          sorbet-static (0.5.10160-#{Gem::Platform.local})
+          sorbet-static-and-runtime (0.5.10160)
+            sorbet (= 0.5.10160)
+            sorbet-runtime (= 0.5.10160)
+
+      PLATFORMS
+        #{lockfile_platforms}
+
+      DEPENDENCIES
+        sorbet-static-and-runtime
+
+      BUNDLED WITH
+         #{Bundler::VERSION}
+    L
+  end
+
   it "does not remove ruby if gems for other platforms, and not present in the lockfile, exist in the Gemfile" do
     build_repo4 do
       build_gem "nokogiri", "1.13.8"