diff --git a/arch/arm/src/efm32/efm32_start.c b/arch/arm/src/efm32/efm32_start.c
index c5e76a46871..0364c3adb21 100644
--- a/arch/arm/src/efm32/efm32_start.c
+++ b/arch/arm/src/efm32/efm32_start.c
@@ -207,7 +207,7 @@ static void go_os_start(void *pv, unsigned int nbytes)
 
   __asm__ __volatile__
   (
-    "\tmov  r1, r1, lsr #2\n"   /* R1 = nwords = nbytes >> 2 */
+    "\tmovs r1, r1, lsr #2\n"   /* R1 = nwords = nbytes >> 2 */
     "\tbeq  2f\n"               /* (should not happen) */
 
     "\tbic  r0, r0, #3\n"       /* R0 = Aligned stackptr */
diff --git a/arch/arm/src/sam34/sam_start.c b/arch/arm/src/sam34/sam_start.c
index 0c2286b9a54..7b754c2a32e 100644
--- a/arch/arm/src/sam34/sam_start.c
+++ b/arch/arm/src/sam34/sam_start.c
@@ -204,7 +204,7 @@ static void go_os_start(void *pv, unsigned int nbytes)
 
   __asm__ __volatile__
   (
-    "\tmov  r1, r1, lsr #2\n"   /* R1 = nwords = nbytes >> 2 */
+    "\tmovs r1, r1, lsr #2\n"   /* R1 = nwords = nbytes >> 2 */
     "\tbeq  2f\n"               /* (should not happen) */
 
     "\tbic  r0, r0, #3\n"       /* R0 = Aligned stackptr */
diff --git a/arch/arm/src/samv7/sam_start.c b/arch/arm/src/samv7/sam_start.c
index 82199b09de5..b2d84703247 100644
--- a/arch/arm/src/samv7/sam_start.c
+++ b/arch/arm/src/samv7/sam_start.c
@@ -276,7 +276,7 @@ static void go_os_start(void *pv, unsigned int nbytes)
 
   __asm__ __volatile__
   (
-    "\tmov  r1, r1, lsr #2\n"   /* R1 = nwords = nbytes >> 2 */
+    "\tmovs r1, r1, lsr #2\n"   /* R1 = nwords = nbytes >> 2 */
     "\tbeq  2f\n"               /* (should not happen) */
 
     "\tbic  r0, r0, #3\n"       /* R0 = Aligned stackptr */
diff --git a/arch/arm/src/stm32/stm32_start.c b/arch/arm/src/stm32/stm32_start.c
index e0613d26fca..911e5139d61 100644
--- a/arch/arm/src/stm32/stm32_start.c
+++ b/arch/arm/src/stm32/stm32_start.c
@@ -208,7 +208,7 @@ static void go_os_start(void *pv, unsigned int nbytes)
 
   __asm__ __volatile__
   (
-    "\tmov  r1, r1, lsr #2\n"   /* R1 = nwords = nbytes >> 2 */
+    "\tmovs r1, r1, lsr #2\n"   /* R1 = nwords = nbytes >> 2 */
     "\tbeq  2f\n"               /* (should not happen) */
 
     "\tbic  r0, r0, #3\n"       /* R0 = Aligned stackptr */