diff --git a/tex/UTB.tex b/tex/UTB.tex
index 0caa0bf..4870595 100644
--- a/tex/UTB.tex
+++ b/tex/UTB.tex
@@ -172,6 +172,9 @@
 			pdfapart=3,
 			pdfaconformance=B,
 			pdflang={cz}
+			% use breaklinks to make have long bibtex urls broken
+			% otherwise they go over the margin (known issue)
+			breaklinks=true
 		}
 	\else \ifenglish
 		\providecommand{\xmpTitle}{\nazeven}
@@ -186,7 +189,10 @@
 			pdflang=la,
 			pdfapart=3,
 			pdfaconformance=B,
-			pdflang={en}
+			pdflang={en},
+			% use breaklinks to make have long bibtex urls broken
+			% otherwise they go over the margin (known issue)
+			breaklinks=true
 		}
 	\fi \fi