diff --git a/alib2std/makefile b/alib2std/makefile
index 0581158ed4ed9caeafbb36319e5dd1d504f0c236..8fa0ae961401a2f60712c46f257cde9a27745d59 100644
--- a/alib2std/makefile
+++ b/alib2std/makefile
@@ -184,7 +184,7 @@ obj-debug/: FORCE obj-debug/makefile
 	$(MAKE) -C $@ OBJECTS_BASE_DIR=$(realpath obj-debug) SOURCES_BASE_DIR=$(realpath src) CXX_OTHER_FLAGS="-O1 -DDEBUG"
 
 obj-release/: FORCE obj-release/makefile
-	$(MAKE) -C $@ OBJECTS_BASE_DIR=$(realpath obj-release) SOURCES_BASE_DIR=$(realpath src) CXX_OTHER_FLAGS="-Ofast -flto -DNDEBUG -DRELEASE"
+	$(MAKE) -C $@ OBJECTS_BASE_DIR=$(realpath obj-release) SOURCES_BASE_DIR=$(realpath src) CXX_OTHER_FLAGS="-O3 -flto -DNDEBUG -DRELEASE"
 
 
 
@@ -227,7 +227,7 @@ test-obj-debug/: FORCE test-obj-debug/makefile
 	$(MAKE) -C $@ OBJECTS_BASE_DIR=$(realpath test-obj-debug) SOURCES_BASE_DIR=$(realpath test-src) CXX_OTHER_FLAGS="-O1 -DDEBUG"
 
 test-obj-release/: FORCE test-obj-release/makefile
-	$(MAKE) -C $@ OBJECTS_BASE_DIR=$(realpath test-obj-release) SOURCES_BASE_DIR=$(realpath test-src) CXX_OTHER_FLAGS="-Ofast -flto -DNDEBUG -DRELEASE"
+	$(MAKE) -C $@ OBJECTS_BASE_DIR=$(realpath test-obj-release) SOURCES_BASE_DIR=$(realpath test-src) CXX_OTHER_FLAGS="-O3 -flto -DNDEBUG -DRELEASE"