diff --git a/Source/WarpX.H b/Source/WarpX.H
index 0a64c550a27..a8be312867c 100644
--- a/Source/WarpX.H
+++ b/Source/WarpX.H
@@ -264,7 +264,7 @@ public:
     //! Solve additional Maxwell equation for G in order to control errors in magnetic Gauss' law
     static bool do_divb_cleaning;
 
-    //! Solve Poisson equation when loading a an external magnetic field to clean divergence
+    //! Solve Poisson equation when loading an external magnetic field to clean divergence
     //! This is useful to remove errors that could lead to non-zero B field divergence
     static bool do_divb_cleaning_external;