diff --git a/contents/solutions/EG220.md b/contents/solutions/EG220.md
index 85b615d..83876ee 100644
--- a/contents/solutions/EG220.md
+++ b/contents/solutions/EG220.md
@@ -1 +1 @@
-Der Buchstabe i in dBi verrät es: Isotropenstrahler.
\ No newline at end of file
+Der Buchstabe i in $\unit{\dBi}$ verrät es: Isotropenstrahler.
\ No newline at end of file