diff --git a/Makefile b/Makefile
index afcf237..3927016 100644
--- a/Makefile
+++ b/Makefile
@@ -20,8 +20,8 @@ CFLAGS += -Wredundant-decls -pedantic
 CFLAGS += -D_XOPEN_SOURCE
 
 CFLAGS += -std=c99
-CFLAGS += -Os -flto
-LDFLAGS += -Os -flto
+CFLAGS += -Os
+LDFLAGS += -Os
 
 TEST_LIBS += -lcmocka
 
diff --git a/scripts/Makefile.stm32f1 b/scripts/Makefile.stm32f1
index b9342ab..11115ad 100644
--- a/scripts/Makefile.stm32f1
+++ b/scripts/Makefile.stm32f1
@@ -2,9 +2,6 @@ PREFIX ?= arm-none-eabi-
 
 LDSCRIPT = support/stm32vl-discovery.ld
 
-CFLAGS += -Os
-LDFLAGS += -Os
-
 CFLAGS += -fno-common --function-sections -fdata-sections
 LDFLAGS += -static -nostartfiles
 LDFLAGS += -Wl,--gc-sections