diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7a172bb3..72eef428 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1358,7 +1358,7 @@ else (FAT_RUNTIME)
             add_library(hs_exec_shared_avx2 OBJECT ${hs_exec_SRCS} ${hs_exec_avx2_SRCS})
             list(APPEND RUNTIME_SHLIBS $<TARGET_OBJECTS:hs_exec_shared_avx2>)
             set_target_properties(hs_exec_shared_avx2 PROPERTIES
-                COMPILE_FLAGS "-march=core-avx2"
+                COMPILE_FLAGS "-march=core-avx2 -mavx2"
                 POSITION_INDEPENDENT_CODE TRUE
                 RULE_LAUNCH_COMPILE "${BUILD_WRAPPER} avx2 ${CMAKE_MODULE_PATH}/keep.syms.in"
                 )
diff --git a/util/CMakeLists.txt b/util/CMakeLists.txt
index 861f2f08..82cee0ff 100644
--- a/util/CMakeLists.txt
+++ b/util/CMakeLists.txt
@@ -33,9 +33,9 @@ SET(corpusomatic_SRCS
     ng_find_matches.cpp
 )
 add_library(corpusomatic STATIC ${corpusomatic_SRCS})
-if (ARCH_IA32)
+if (ARCH_IA32 OR ARCH_X86_64)
     set_target_properties(corpusomatic PROPERTIES COMPILE_FLAGS "-mssse3")
-endif (ARCH_IA32)
+endif ()
 
 set(databaseutil_SRCS
     database_util.cpp