diff --git a/CHANGELOG.md b/CHANGELOG.md
index 78be1c8..40b8abc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ### Fixes
 
+- Restore literal false in parameter expansion (#68)
+
 ### Breaks
 
 ## 2.0.1 - (2025-02-16)
diff --git a/lib/restify/relation.rb b/lib/restify/relation.rb
index c5f0cb1..9b469cd 100644
--- a/lib/restify/relation.rb
+++ b/lib/restify/relation.rb
@@ -113,8 +113,12 @@ def convert_param(value, nesting: true)
 
     def extract!(params)
       @template.variables.each_with_object({}) do |var, hash|
-        if (value = params.delete(var) { params.delete(var.to_sym) { nil } })
-          hash[var] = value
+        sym = var.to_sym
+        if params.key?(var)
+          hash[var] = params.delete(var)
+        end
+        if params.key?(sym)
+          hash[sym] = params.delete(sym)
         end
       end
     end
diff --git a/spec/restify/relation_spec.rb b/spec/restify/relation_spec.rb
index 1a0da64..c54f519 100644
--- a/spec/restify/relation_spec.rb
+++ b/spec/restify/relation_spec.rb
@@ -38,7 +38,7 @@ def to_param
     context 'with false' do
       let(:params) { {id: false} }
 
-      it { expect(expanded.to_s).to eq 'http://test.host/resource/' }
+      it { expect(expanded.to_s).to eq 'http://test.host/resource/false' }
     end
 
     context 'with true' do
@@ -59,6 +59,27 @@ def to_param
       it { expect(expanded.to_s).to eq 'http://test.host/resource/1,2' }
     end
 
+    context 'with nil query parameter' do
+      let(:pattern) { '/resource{?abc}' }
+      let(:params) { {abc: nil} }
+
+      it { expect(expanded.to_s).to eq 'http://test.host/resource' }
+    end
+
+    context 'with false query parameter' do
+      let(:pattern) { '/resource{?abc}' }
+      let(:params) { {abc: false} }
+
+      it { expect(expanded.to_s).to eq 'http://test.host/resource?abc=false' }
+    end
+
+    context 'with true query parameter' do
+      let(:pattern) { '/resource{?abc}' }
+      let(:params) { {abc: true} }
+
+      it { expect(expanded.to_s).to eq 'http://test.host/resource?abc=true' }
+    end
+
     context 'with unknown additional query parameter' do
       let(:pattern) { '/resource{?a,b}' }
       let(:params) { {a: 1, b: 2, c: 3} }
@@ -119,6 +140,38 @@ def to_param
 
       it { expect { expanded }.to raise_exception TypeError, /Can't convert Hash into String./ }
     end
+
+    context 'with string-keyed params' do
+      context 'with value' do
+        let(:params) { {'id' => 1} }
+
+        it { expect(expanded.to_s).to eq 'http://test.host/resource/1' }
+      end
+    end
+
+    context 'with mixed-keyed params' do
+      context 'non-overlapping' do
+        let(:params) { {'id' => 1, q: 2} }
+
+        it { expect(expanded.to_s).to eq 'http://test.host/resource/1?q=2' }
+      end
+
+      context 'overlapping (1)' do
+        let(:params) { {'id' => 1, id: 2} }
+
+        it 'prefers symbol value' do
+          expect(expanded.to_s).to eq 'http://test.host/resource/2'
+        end
+      end
+
+      context 'overlapping (2)' do
+        let(:params) { {id: 2, 'id' => 1} }
+
+        it 'prefers symbol value' do
+          expect(expanded.to_s).to eq 'http://test.host/resource/2'
+        end
+      end
+    end
   end
 
   shared_examples 'non-data-request' do |method|