diff --git a/arch/arm/src/armv7-a/arm_cpuhead.S b/arch/arm/src/armv7-a/arm_cpuhead.S
index 07cd6fb12bb..00edad25fbf 100644
--- a/arch/arm/src/armv7-a/arm_cpuhead.S
+++ b/arch/arm/src/armv7-a/arm_cpuhead.S
@@ -68,6 +68,8 @@
  ****************************************************************************/
 
 	.text
+	.syntax	unified
+	.arm
 
 /****************************************************************************
  * Name: __cpu[n]_start
diff --git a/arch/arm/src/armv7-a/arm_fpuconfig.S b/arch/arm/src/armv7-a/arm_fpuconfig.S
index 06fa011d033..a45a38f34f0 100644
--- a/arch/arm/src/armv7-a/arm_fpuconfig.S
+++ b/arch/arm/src/armv7-a/arm_fpuconfig.S
@@ -47,6 +47,8 @@
  ****************************************************************************/
 
 	.text
+	.syntax	unified
+	.arm
 
 /****************************************************************************
  * Public Functions
diff --git a/arch/arm/src/armv7-a/arm_head.S b/arch/arm/src/armv7-a/arm_head.S
index 14526022020..5f0a6c3b32c 100644
--- a/arch/arm/src/armv7-a/arm_head.S
+++ b/arch/arm/src/armv7-a/arm_head.S
@@ -168,6 +168,8 @@
  */
 
 	.text
+	.syntax	unified
+	.arm
 	.global	__start
 	.type	__start, #function
 
diff --git a/arch/arm/src/armv7-a/arm_pghead.S b/arch/arm/src/armv7-a/arm_pghead.S
index a76f53a4c12..b0c6533f2f8 100644
--- a/arch/arm/src/armv7-a/arm_pghead.S
+++ b/arch/arm/src/armv7-a/arm_pghead.S
@@ -197,6 +197,8 @@
  */
 
 	.text
+	.syntax	unified
+	.arm
 	.global	__start
 	.type	__start, #function
 
diff --git a/arch/arm/src/armv7-a/arm_vectoraddrexcptn.S b/arch/arm/src/armv7-a/arm_vectoraddrexcptn.S
index 6a2cf851100..af407a4f582 100644
--- a/arch/arm/src/armv7-a/arm_vectoraddrexcptn.S
+++ b/arch/arm/src/armv7-a/arm_vectoraddrexcptn.S
@@ -46,12 +46,8 @@
  ****************************************************************************/
 
 	.text
-
-/****************************************************************************
- * Public Functions
- ****************************************************************************/
-
-	.text
+	.syntax	unified
+	.arm
 
 /****************************************************************************
  *  Name: arm_vectoraddrexcptn
diff --git a/arch/arm/src/armv7-a/arm_vectors.S b/arch/arm/src/armv7-a/arm_vectors.S
index fb7c195c0f1..12952621b43 100644
--- a/arch/arm/src/armv7-a/arm_vectors.S
+++ b/arch/arm/src/armv7-a/arm_vectors.S
@@ -152,6 +152,8 @@
  ****************************************************************************/
 
 	.text
+	.syntax	unified
+	.arm
 
 /****************************************************************************
  * Public Functions
diff --git a/arch/arm/src/armv7-a/arm_vectortab.S b/arch/arm/src/armv7-a/arm_vectortab.S
index 39528d5c084..66c30fc3719 100644
--- a/arch/arm/src/armv7-a/arm_vectortab.S
+++ b/arch/arm/src/armv7-a/arm_vectortab.S
@@ -38,6 +38,9 @@
 	.eabi_attribute Tag_ABI_align_preserved, 1
 #endif
 
+	.syntax	unified
+	.arm
+
 	.globl		_vector_start
 	.globl		_vector_end
 
diff --git a/arch/arm/src/armv7-r/arm_fpuconfig.S b/arch/arm/src/armv7-r/arm_fpuconfig.S
index 192aecb019e..f6338c6cd5a 100644
--- a/arch/arm/src/armv7-r/arm_fpuconfig.S
+++ b/arch/arm/src/armv7-r/arm_fpuconfig.S
@@ -47,6 +47,8 @@
  ****************************************************************************/
 
 	.text
+	.syntax	unified
+	.arm
 
 /****************************************************************************
  * Public Functions
diff --git a/arch/arm/src/armv7-r/arm_head.S b/arch/arm/src/armv7-r/arm_head.S
index 5fd19f5dc49..5f417b5f153 100644
--- a/arch/arm/src/armv7-r/arm_head.S
+++ b/arch/arm/src/armv7-r/arm_head.S
@@ -131,6 +131,8 @@
  */
 
 	.text
+	.syntax	unified
+	.arm
 	.global	__start
 	.type	__start, #function
 
diff --git a/arch/arm/src/armv7-r/arm_vectoraddrexcptn.S b/arch/arm/src/armv7-r/arm_vectoraddrexcptn.S
index 02354752ee2..cefe180ac08 100644
--- a/arch/arm/src/armv7-r/arm_vectoraddrexcptn.S
+++ b/arch/arm/src/armv7-r/arm_vectoraddrexcptn.S
@@ -46,12 +46,8 @@
  ****************************************************************************/
 
 	.text
-
-/****************************************************************************
- * Public Functions
- ****************************************************************************/
-
-	.text
+	.syntax	unified
+	.arm
 
 /****************************************************************************
  *  Name: arm_vectoraddrexcptn
diff --git a/arch/arm/src/armv7-r/arm_vectors.S b/arch/arm/src/armv7-r/arm_vectors.S
index ab7a4b1b85b..659ac8d2493 100644
--- a/arch/arm/src/armv7-r/arm_vectors.S
+++ b/arch/arm/src/armv7-r/arm_vectors.S
@@ -106,6 +106,8 @@
  ****************************************************************************/
 
 	.text
+	.syntax	unified
+	.arm
 
 /****************************************************************************
  * Public Functions
diff --git a/arch/arm/src/armv7-r/arm_vectortab.S b/arch/arm/src/armv7-r/arm_vectortab.S
index 41db3f67e88..db48a055c8a 100644
--- a/arch/arm/src/armv7-r/arm_vectortab.S
+++ b/arch/arm/src/armv7-r/arm_vectortab.S
@@ -38,6 +38,9 @@
 	.eabi_attribute Tag_ABI_align_preserved, 1
 #endif
 
+	.syntax	unified
+	.arm
+
 	.globl		_vector_start
 	.globl		_vector_end