diff --git a/fpm.toml b/fpm.toml
index ff65d88..33b1fe4 100644
--- a/fpm.toml
+++ b/fpm.toml
@@ -7,6 +7,7 @@ license    = "LICENSE"
 
 [preprocess]
 [preprocess.cpp]
+[preprocess.fypp]
 macros = []
 # macros = ["OMP","MPI"]