diff --git a/src/platforms/f4discovery/Makefile.inc b/src/platforms/f4discovery/Makefile.inc
index b04cf415..b36bf8f2 100644
--- a/src/platforms/f4discovery/Makefile.inc
+++ b/src/platforms/f4discovery/Makefile.inc
@@ -7,7 +7,7 @@ CFLAGS += -Istm32/include -mcpu=cortex-m4 -mthumb \
 	-DSTM32F4 -DF4DISCOVERY -I../libopencm3/include \
 	-Iplatforms/stm32
 
-LDFLAGS = -lopencm3_stm32f4 -Wl,--defsym,_stack=0x20010000 \
+LDFLAGS = -lopencm3_stm32f4 \
 	-Wl,-T,platforms/stm32/f4discovery.ld -nostartfiles -lc -lnosys \
 	-Wl,-Map=mapfile -mthumb -mcpu=cortex-m4 -Wl,-gc-sections \
 	-mfloat-abi=hard -mfpu=fpv4-sp-d16 \
diff --git a/src/platforms/hydrabus/Makefile.inc b/src/platforms/hydrabus/Makefile.inc
index 36973e0b..1c2bf7d1 100644
--- a/src/platforms/hydrabus/Makefile.inc
+++ b/src/platforms/hydrabus/Makefile.inc
@@ -7,7 +7,7 @@ CFLAGS += -Istm32/include -mcpu=cortex-m4 -mthumb \
 	-DSTM32F4 -DHYDRABUS -I../libopencm3/include \
 	-Iplatforms/stm32
 
-LDFLAGS = -lopencm3_stm32f4 -Wl,--defsym,_stack=0x20006000 \
+LDFLAGS = -lopencm3_stm32f4 \
 	-Wl,-T,platforms/stm32/f4discovery.ld -nostartfiles -lc -lnosys \
 	-Wl,-Map=mapfile -mthumb -mcpu=cortex-m4 -Wl,-gc-sections \
 	-mfloat-abi=hard -mfpu=fpv4-sp-d16 \
diff --git a/src/platforms/native/Makefile.inc b/src/platforms/native/Makefile.inc
index 48baca3c..1055570d 100644
--- a/src/platforms/native/Makefile.inc
+++ b/src/platforms/native/Makefile.inc
@@ -6,8 +6,7 @@ CFLAGS += -Istm32/include -mcpu=cortex-m3 -mthumb \
 	-DSTM32F1 -DBLACKMAGIC -I../libopencm3/include \
 	-Iplatforms/stm32
 
-LDFLAGS_BOOT := $(LDFLAGS) --specs=nano.specs \
-	-lopencm3_stm32f1 -Wl,--defsym,_stack=0x20005000 \
+LDFLAGS_BOOT := $(LDFLAGS) --specs=nano.specs -lopencm3_stm32f1 \
 	-Wl,-T,platforms/stm32/blackmagic.ld -nostartfiles -lc \
 	-Wl,-Map=mapfile -mthumb -mcpu=cortex-m3 -Wl,-gc-sections \
 	-L../libopencm3/lib
diff --git a/src/platforms/stlink/Makefile.inc b/src/platforms/stlink/Makefile.inc
index 4bde36c6..9dc971a6 100644
--- a/src/platforms/stlink/Makefile.inc
+++ b/src/platforms/stlink/Makefile.inc
@@ -6,8 +6,7 @@ OPT_FLAGS = -Os
 CFLAGS += -mcpu=cortex-m3 -mthumb \
 	-DSTM32F1 -DDISCOVERY_STLINK -I../libopencm3/include \
 	-I platforms/stm32
-LDFLAGS_BOOT := $(LDFLAGS) --specs=nano.specs \
-	-lopencm3_stm32f1 -Wl,--defsym,_stack=0x20005000 \
+LDFLAGS_BOOT := $(LDFLAGS) --specs=nano.specs -lopencm3_stm32f1 \
 	-Wl,-T,platforms/stm32/stlink.ld -nostartfiles -lc \
 	-Wl,-Map=mapfile -mthumb -mcpu=cortex-m3 -Wl,-gc-sections \
 	-L../libopencm3/lib
diff --git a/src/platforms/swlink/Makefile.inc b/src/platforms/swlink/Makefile.inc
index 19941ab5..9c4394db 100644
--- a/src/platforms/swlink/Makefile.inc
+++ b/src/platforms/swlink/Makefile.inc
@@ -6,8 +6,7 @@ OPT_FLAGS = -Os
 CFLAGS += -mcpu=cortex-m3 -mthumb \
 	-DSTM32F1 -DDISCOVERY_SWLINK -I../libopencm3/include \
 	-I platforms/stm32
-LDFLAGS_BOOT := $(LDFLAGS) --specs=nano.specs \
-	-lopencm3_stm32f1 -Wl,--defsym,_stack=0x20005000 \
+LDFLAGS_BOOT := $(LDFLAGS) --specs=nano.specs -lopencm3_stm32f1 \
 	-Wl,-T,platforms/stm32/stlink.ld -nostartfiles -lc\
 	-Wl,-Map=mapfile -mthumb -mcpu=cortex-m3 -Wl,-gc-sections \
 	-L../libopencm3/lib