1 files changed, 4 insertions, 0 deletions
diff --git a/Source/Parser/WarpXParser.H b/Source/Parser/WarpXParser.H
index 046491e29..ffa61e457 100644
--- a/Source/Parser/WarpXParser.H
+++ b/Source/Parser/WarpXParser.H
@@ -13,6 +13,8 @@
 #include <omp.h>
 #endif
 
+class GpuParser;
+
 class WarpXParser
 {
 public:
@@ -46,6 +48,8 @@ public:
 
     std::set<std::string> symbols () const;
 
+    friend class GpuParser;
+
 private:
     void clear ();