diff --git a/build_tests/two_sources/build.rb b/build_tests/two_sources/build.rb
new file mode 100644
index 0000000..a498ded
--- /dev/null
+++ b/build_tests/two_sources/build.rb
@@ -0,0 +1,4 @@
+Rscons::Environment.new(echo: :command) do |env|
+  env.Object("one.o", "one.c", 'CPPFLAGS' => ['-DONE'])
+  env.Program('two_sources', ['one.o', 'two.c'])
+end
diff --git a/build_tests/two_sources/one.c b/build_tests/two_sources/one.c
new file mode 100644
index 0000000..93ba280
--- /dev/null
+++ b/build_tests/two_sources/one.c
@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+#ifdef ONE
+int main(int argc, char *argv[])
+{
+    printf("This is a C program with two sources.\n");
+}
+#endif
diff --git a/build_tests/two_sources/two.c b/build_tests/two_sources/two.c
new file mode 100644
index 0000000..d4d6c8c
--- /dev/null
+++ b/build_tests/two_sources/two.c
@@ -0,0 +1,3 @@
+#ifdef ONE
+#error ONE should not be defined
+#endif
diff --git a/spec/build_tests_spec.rb b/spec/build_tests_spec.rb
index d74244a..bf447f7 100644
--- a/spec/build_tests_spec.rb
+++ b/spec/build_tests_spec.rb
@@ -143,4 +143,14 @@ describe Rscons do
     `./simple`.should == "This is a simple C++ program\n"
   end
 
+  it 'allows overriding construction variables for individual builder calls' do
+    lines = test_dir('two_sources')
+    lines.should == [
+      'gcc -c -o one.o -MMD -MF one.mf -DONE one.c',
+      'gcc -c -o two.o -MMD -MF two.mf two.c',
+      'gcc -o two_sources one.o two.o',
+    ]
+    File.exists?('two_sources').should be_true
+    `./two_sources`.should == "This is a C program with two sources.\n"
+  end
 end