diff --git a/mff/diplomky/slides/Makefile b/mff/diplomky/slides/Makefile
index bb47ea4..bd4a100 100644
--- a/mff/diplomky/slides/Makefile
+++ b/mff/diplomky/slides/Makefile
@@ -1,3 +1,5 @@
+SHELL=/bin/bash
+
 all: bcintro.pdf
 
 bcintro.pdf: bcintro.tex