diff --git a/.github/workflows/testsuite.yml b/.github/workflows/testsuite.yml
index 56388979d..44694d12a 100644
--- a/.github/workflows/testsuite.yml
+++ b/.github/workflows/testsuite.yml
@@ -127,7 +127,7 @@ jobs:
         uses: actions/cache@9255dc7a253b0ccc959486e2bca901246202afeb # v5.0.1
         if: ${{ ! matrix.standalone }}
         with:
-          key: cython-extensions-${{ matrix.os.image }}-${{ matrix.python-version }}-32bit-${{ matrix.float_dtype_32 }}
+          key: cython-extensions-${{ matrix.os.image }}-${{ runner.arch }}-${{ matrix.python-version }}-32bit-${{ matrix.float_dtype_32 }}
           path: ${{ steps.cython-cache.outputs.cachedir }}
 
       - name: Run Tests
diff --git a/brian2/codegen/generators/GSL_generator.py b/brian2/codegen/generators/GSL_generator.py
index cd9ea2c01..3f7d8d652 100644
--- a/brian2/codegen/generators/GSL_generator.py
+++ b/brian2/codegen/generators/GSL_generator.py
@@ -1079,20 +1079,13 @@ def unpack_namespace_single(self, var_obj, in_vector, in_scalar):
         code = []
         if isinstance(var_obj, ArrayVariable):
             array_name = self.generator.get_array_name(var_obj)
-            dtype = self.c_data_type(var_obj.dtype)
             if in_vector:
-                code += [
-                    f"_GSL_dataholder.{array_name} = <{dtype} *> _buf_{array_name}.data"
-                ]
-            if in_scalar:
-                code += [f"{array_name} = <{dtype} *> _buf_{array_name}.data"]
+                code += [f"_GSL_dataholder.{array_name} = {array_name}"]
         else:
             if in_vector:
                 code += [
                     f'_GSL_dataholder.{var_obj.name} = _namespace["{var_obj.name}"]'
                 ]
-            if in_scalar:
-                code += [f'{var_obj.name} = _namespace["{var_obj.name}"]']
         return "\n".join(code)
 
     @staticmethod
diff --git a/brian2/codegen/generators/cython_generator.py b/brian2/codegen/generators/cython_generator.py
index baf6000b3..b66f26061 100644
--- a/brian2/codegen/generators/cython_generator.py
+++ b/brian2/codegen/generators/cython_generator.py
@@ -440,7 +440,7 @@ def determine_keywords(self):
                                 " _buf_{array_name} = _namespace['{array_name}']"
                             ),
                             (
-                                "cdef {cpp_dtype} * {array_name} = <{cpp_dtype} *>"
+                                "cdef char* {array_name} = <char *>"
                                 " _buf_{array_name}.data"
                             ),
                         ]