diff --git a/interpreter.py b/interpreter.py
index a3b5e6faf..ffad8819a 100644
--- a/interpreter.py
+++ b/interpreter.py
@@ -210,8 +210,9 @@ class ExternalLibraryHolder(InterpreterObject):
         return self.el.get_exe_args()
 
 class GeneratorHolder(InterpreterObject):
-    def __init__(self, args, kwargs):
+    def __init__(self, interpreter, args, kwargs):
         super().__init__()
+        self.interpreter = interpreter
         self.generator = build.Generator(args, kwargs)
         self.methods.update({'process' : self.process_method})
 
@@ -226,7 +227,7 @@ class GeneratorHolder(InterpreterObject):
             if not isinstance(a, str):
                 raise InvalidArguments('A non-string object in "process" arguments.')
         gl = GeneratedListHolder(self)
-        [gl.add_file(a) for a in args]
+        [gl.add_file(os.path.join(self.interpreter.subdir, a)) for a in args]
         return gl
 
 class GeneratedListHolder(InterpreterObject):
@@ -1085,7 +1086,7 @@ class Interpreter():
         return tg
 
     def func_generator(self, node, args, kwargs):
-        gen = GeneratorHolder(args, kwargs)
+        gen = GeneratorHolder(self, args, kwargs)
         self.generators.append(gen)
         return gen
 
diff --git a/test cases/common/30 pipeline/meson.build b/test cases/common/30 pipeline/meson.build
index f639876bf..0a430bde1 100644
--- a/test cases/common/30 pipeline/meson.build	
+++ b/test cases/common/30 pipeline/meson.build	
@@ -1,14 +1,5 @@
 project('pipeline test', 'c')
 
-e1 = executable('srcgen', 'srcgen.c', native : true)
-
-# Generate a header file that needs to be included.
-gen = generator(e1,
- output  : '@BASENAME@.h',
- arguments : ['@INPUT@', '@OUTPUT@'])
-
-generated = gen.process('input_src.dat')
-
-e2 = executable('prog', 'prog.c', generated)
-
-test('pipelined', e2)
\ No newline at end of file
+# This is in a subdirectory to make sure
+# we write proper subdir paths to output.
+subdir('src')
diff --git a/test cases/common/30 pipeline/input_src.dat b/test cases/common/30 pipeline/src/input_src.dat
similarity index 100%
rename from test cases/common/30 pipeline/input_src.dat
rename to test cases/common/30 pipeline/src/input_src.dat
diff --git a/test cases/common/30 pipeline/src/meson.build b/test cases/common/30 pipeline/src/meson.build
new file mode 100644
index 000000000..4e9ac116a
--- /dev/null
+++ b/test cases/common/30 pipeline/src/meson.build	
@@ -0,0 +1,12 @@
+e1 = executable('srcgen', 'srcgen.c', native : true)
+
+# Generate a header file that needs to be included.
+gen = generator(e1,
+ output  : '@BASENAME@.h',
+ arguments : ['@INPUT@', '@OUTPUT@'])
+
+generated = gen.process('input_src.dat')
+
+e2 = executable('prog', 'prog.c', generated)
+
+test('pipelined', e2)
diff --git a/test cases/common/30 pipeline/prog.c b/test cases/common/30 pipeline/src/prog.c
similarity index 100%
rename from test cases/common/30 pipeline/prog.c
rename to test cases/common/30 pipeline/src/prog.c
diff --git a/test cases/common/30 pipeline/srcgen.c b/test cases/common/30 pipeline/src/srcgen.c
similarity index 100%
rename from test cases/common/30 pipeline/srcgen.c
rename to test cases/common/30 pipeline/src/srcgen.c