diff --git a/Make.Microphysics_extern b/Make.Microphysics_extern
index 08dc313db..17f45478c 100644
--- a/Make.Microphysics_extern
+++ b/Make.Microphysics_extern
@@ -126,7 +126,7 @@ ifeq ($(USE_CONDUCTIVITY),TRUE)
   EXTERN_CORE += $(CONDUCTIVITY_PATH)
 endif
 
-# backwards compatability -- remove after 25.01
+# backwards compatibility -- remove after 25.01
 ifdef Opacity_dir
    OPACITY_DIR=$(Opacity_dir)
 endif