diff --git a/CMakeLists.txt b/CMakeLists.txt
index 695edde51..81f4abd6b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -6,11 +6,9 @@ include(FeatureSummary)
 set(CMAKE_FIND_PACKAGE_SORT_ORDER NATURAL)
 set(CMAKE_FIND_PACKAGE_SORT_DIRECTION DEC)
 set(C3_LLVM_VERSION "auto" CACHE STRING "Use LLVM version [default: auto]")
-option(C3_USE_MIMALLOC "Use built-in mimalloc" ON)
+option(C3_USE_MIMALLOC "Use built-in mimalloc" OFF)
 set(C3_MIMALLOC_TAG "v1.7.3" CACHE STRING "Used version of mimalloc")
 
-set(C3_USE_MIMALLOC OFF)
-
 if(C3_USE_MIMALLOC)
     option(MI_BUILD_TESTS OFF)
     option(MI_BUILD_SHARED OFF)