diff --git a/src/fields/fft_poisson_solver/fft/CuFFTUtils.H b/src/fields/fft_poisson_solver/fft/CuFFTUtils.H
index 69ca55136f..1b6e973d5a 100644
--- a/src/fields/fft_poisson_solver/fft/CuFFTUtils.H
+++ b/src/fields/fft_poisson_solver/fft/CuFFTUtils.H
@@ -3,6 +3,9 @@
 
 #include <cufft.h>
 
+#include <string>
+
+
 namespace CuFFTUtils
 {
     /** \brief This method converts a cufftResult