diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7b485cc66..2ecfd4503 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -149,7 +149,7 @@ ecm_setup_version(${KF5_VERSION}
                   VARIABLE_PREFIX PLASMA
                   VERSION_HEADER "${CMAKE_CURRENT_BINARY_DIR}/plasma_version.h"
                   PACKAGE_VERSION_FILE "${CMAKE_CURRENT_BINARY_DIR}/KF5PlasmaConfigVersion.cmake"
-)
+                  SOVERSION 5)
 
 set(CMAKECONFIG_INSTALL_DIR "${CMAKECONFIG_INSTALL_PREFIX}/KF5Plasma")