diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4d0c1c3..da6aa78 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -6,6 +6,11 @@ disallow_intree_builds()
 
 project (utf8proc C)
 
+# Be sure to also update these in Makefile!
+set(SO_MAJOR 1)
+set(SO_MINOR 2)
+set(SO_PATCH 0)
+
 add_definitions (
   -DUTF8PROC_EXPORTS
 )
@@ -19,4 +24,8 @@ add_library (utf8proc
   utf8proc.h
 )
 
-set_property (TARGET utf8proc PROPERTY POSITION_INDEPENDENT_CODE ON)
+set_target_properties (utf8proc PROPERTIES
+  POSITION_INDEPENDENT_CODE ON
+  VERSION "${SO_MAJOR}.${SO_MINOR}.${SO_PATCH}"
+  SOVERSION ${SO_MAJOR}
+)
diff --git a/Makefile b/Makefile
index 99571e3..f40a116 100644
--- a/Makefile
+++ b/Makefile
@@ -16,6 +16,7 @@ cc = $(CC) $(cflags)
 # from the utf8proc version number because it indicates ABI compatibility,
 # not API compatibility: MAJOR should be incremented whenever *binary*
 # compatibility is broken, even if the API is backward-compatible
+# Be sure to also update these in CMakeLists.txt!
 MAJOR=1
 MINOR=2
 PATCH=0