diff --git a/tools/export/gnuarmeclipse/__init__.py b/tools/export/gnuarmeclipse/__init__.py
index f6cc2d0e4d..5d4dcc8b7d 100644
--- a/tools/export/gnuarmeclipse/__init__.py
+++ b/tools/export/gnuarmeclipse/__init__.py
@@ -244,7 +244,7 @@ class GNUARMEclipse(Exporter):
             opts['ld']['system_libraries'] = self.system_libraries
             opts['ld']['script'] = join(id.capitalize(),
                                         "linker-script-%s.ld" % id)
-            opts['cpp_cmd'] = "".join('"{}"'.format(toolchain.preproc[0])) + " " + " ".join(toolchain.preproc[1:])
+            opts['cpp_cmd'] = '"{}"'.format(toolchain.preproc[0]) + " " + " ".join(toolchain.preproc[1:])
 
             # Unique IDs used in multiple places.
             # Those used only once are implemented with {{u.id}}.