diff --git a/lib/sl/Makefile.am b/lib/sl/Makefile.am
index 80d5fa4ea..5f79a4ea0 100644
--- a/lib/sl/Makefile.am
+++ b/lib/sl/Makefile.am
@@ -8,7 +8,7 @@ include_HEADERS = sl.h
 
 lib_LTLIBRARIES = libsl.la libss.la
 libsl_la_LDFLAGS = -version-info 1:0:1
-libss_la_LDFLAGS = -version-info 1:1:1
+libss_la_LDFLAGS = -version-info 1:2:1
 
 libsl_la_LIBADD = @LIB_readline@
 libss_la_LIBADD = @LIB_readline@