diff --git a/CMakeLists.txt b/CMakeLists.txt
index 19b0f65..e1568ee 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -11,6 +11,7 @@ option(ZMIJ_EXAMPLE "Generate the example targets" ON)
 
 add_library(zmij zmij.cc zmij-int.cc zmij.h)
 add_library(zmij::zmij ALIAS zmij)
+set_target_properties(zmij PROPERTIES SOVERSION 1)
 target_include_directories(
   zmij PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
               $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>)