diff --git a/src/isdb/SAXSgpu.cpp b/src/isdb/SAXSgpu.cpp
index 9eb630dc49fd8d471483f5e124c9a16022b81505..9e351ada788e4fe0a1346fae2fbf87568554828b 100644
--- a/src/isdb/SAXSgpu.cpp
+++ b/src/isdb/SAXSgpu.cpp
@@ -103,7 +103,6 @@ private:
   vector<double>      q_list;
 #ifdef  __PLUMED_HAS_ARRAYFIRE
   af::array           FF_value;
-  af::array           q_value;
 #endif
   void getMartiniSFparam(const vector<AtomNumber> &atoms, vector<vector<long double> > &parameter);
   void calculateASF(const vector<AtomNumber> &atoms, vector<vector<long double> > &FF_tmp, const double rho);