diff --git a/CMakeLists.txt b/CMakeLists.txt
index 59d889b8..7b455881 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -14,7 +14,7 @@ option(MI_SECURE_FULL       "Use full security mitigations, may be more expensiv
 option(MI_LOCAL_DYNAMIC_TLS "Use slightly slower, dlopen-compatible TLS mechanism (Unix)" OFF)
 option(MI_BUILD_TESTS       "Build test executables" ON)
 
-set(mi_install_dir "lib/mimalloc-${mi_version}")
+set(mi_install_dir "${CMAKE_INSTALL_PREFIX}/lib/mimalloc-${mi_version}")
 
 set(mi_sources
     src/stats.c