diff --git a/st/st.c b/st/st.c
index 85b500e..4fbb048 100644
--- a/st/st.c
+++ b/st/st.c
@@ -779,6 +779,7 @@ execsh(char *cmd, char **args)
 	unsetenv("COLUMNS");
 	unsetenv("LINES");
 	unsetenv("TERMCAP");
+	unsetenv("XMODIFIERS");
 	setenv("LOGNAME", pw->pw_name, 1);
 	setenv("USER", pw->pw_name, 1);
 	setenv("SHELL", sh, 1);