diff --git a/fortran.nanorc b/fortran.nanorc
index 40623ee..85cfee4 100644
--- a/fortran.nanorc
+++ b/fortran.nanorc
@@ -43,4 +43,4 @@ color magenta "[(){}]" "\[" "\]"
 icolor brightblue "<[^=     ]*>" ""(\\.|[^"])*""
 
 ## Comment highlighting
-icolor brightred "^!.*" "^c.*" "^C.*"
+icolor brightred "!.*$" "(^[Cc]| [Cc]) .*$"