diff --git a/build.sh b/build.sh
index b23fa0a..00779f0 100755
--- a/build.sh
+++ b/build.sh
@@ -1,6 +1,6 @@
 #!/bin/sh -e
 
-RELEASE_FLAGS="-Os -DNDEBUG -g0 -s"
+RELEASE_FLAGS="-DNDEBUG -O2 -g0 -s"
 DEBUG_FLAGS="-std=c89 -D_POSIX_C_SOURCE=199309L -DDEBUG -Wall -Wno-unknown-pragmas -Wpedantic -Wshadow -Wextra -Werror=implicit-int -Werror=incompatible-pointer-types -Werror=int-conversion -Wvla -g -Og -fsanitize=address -fsanitize=undefined"
 CORE_DEVICES="src/uxn.c src/devices/system.c src/devices/file.c src/devices/datetime.c -lpthread"
 EMU_INC="${CORE_DEVICES} src/devices/screen.c src/devices/controller.c src/devices/mouse.c src/uxn11.c -o bin/uxn11 -lX11"