diff --git a/arch/arm/src/arm/atomics.s b/arch/arm/src/arm/atomics.s
index ecf3f05ad0022d9897e7ef01e1e6ff1e4d17d542..5c5b0e3ed481ee6f78a97509bb7892acac27b1e6 100644
--- a/arch/arm/src/arm/atomics.s
+++ b/arch/arm/src/arm/atomics.s
@@ -1,3 +1,4 @@
+.syntax unified
 .text
 
 .global __a_barrier
diff --git a/crt/arm/crti.s b/crt/arm/crti.s
index 1ba165c5c55a5c9dbe1a3ba94800ceb88d647180..18dc1e41972e500abca0057ec693d0b2f754ba98 100644
--- a/crt/arm/crti.s
+++ b/crt/arm/crti.s
@@ -1,3 +1,5 @@
+.syntax unified
+
 .section .init
 .global _init
 .type _init,%function
diff --git a/crt/arm/crtn.s b/crt/arm/crtn.s
index b3eca856f0d1ac72cfdd775e5b57444a972ce8c8..dc020f92ef89893247d42640152325315b7c1e8e 100644
--- a/crt/arm/crtn.s
+++ b/crt/arm/crtn.s
@@ -1,3 +1,5 @@
+.syntax unified
+
 .section .init
 	pop {r0,lr}
 	bx lr
diff --git a/src/fenv/armhf/fenv.s b/src/fenv/armhf/fenv.s
index e447ca1032f43b78067edb4165b7f313f0cdb549..53307e68e1b86e03d20f132712c2e96b5f3cb9de 100644
--- a/src/fenv/armhf/fenv.s
+++ b/src/fenv/armhf/fenv.s
@@ -1,3 +1,4 @@
+.syntax unified
 .fpu vfp
 
 .global fegetround
diff --git a/src/internal/arm/syscall.s b/src/internal/arm/syscall.s
index 28cb17ba8641407d042db372a354e3376af62753..64dba2fcb7b93289575361e621287c2804e7682b 100644
--- a/src/internal/arm/syscall.s
+++ b/src/internal/arm/syscall.s
@@ -1,3 +1,4 @@
+.syntax unified
 .global __syscall
 .hidden __syscall
 .type __syscall,%function
diff --git a/src/ldso/arm/dlsym.s b/src/ldso/arm/dlsym.s
index 3b88d91038b6973c1b04540deda76736aa1e244a..2652c348d795533f5ea52e2a6510fdb4416d0527 100644
--- a/src/ldso/arm/dlsym.s
+++ b/src/ldso/arm/dlsym.s
@@ -1,3 +1,4 @@
+.syntax unified
 .text
 .global dlsym
 .hidden __dlsym
diff --git a/src/math/armhf/fabs.s b/src/math/armhf/fabs.s
index 8a705e1baca09e544b4c69bd4f67a4f217f0623f..0eb458d3a2f4b78a8b3cb09b8e9b54399e29cd4b 100644
--- a/src/math/armhf/fabs.s
+++ b/src/math/armhf/fabs.s
@@ -1,3 +1,4 @@
+.syntax unified
 .fpu vfp
 .text
 .global fabs
diff --git a/src/math/armhf/fabsf.s b/src/math/armhf/fabsf.s
index 2c7beb6ca1e6c15884c6282cc13e07c62e52f304..da3809bb60eea04b0c7f4d446df4c68abcc67bf6 100644
--- a/src/math/armhf/fabsf.s
+++ b/src/math/armhf/fabsf.s
@@ -1,3 +1,4 @@
+.syntax unified
 .fpu vfp
 .text
 .global fabsf
diff --git a/src/math/armhf/sqrt.s b/src/math/armhf/sqrt.s
index 90f74a92b67a51d247b532ac4aca1a7c94490356..e38f060ddd7bf15d172884b122e8614ea8007980 100644
--- a/src/math/armhf/sqrt.s
+++ b/src/math/armhf/sqrt.s
@@ -1,3 +1,4 @@
+.syntax unified
 .fpu vfp
 .text
 .global sqrt
diff --git a/src/math/armhf/sqrtf.s b/src/math/armhf/sqrtf.s
index 91d8ad6db8c8cbe1387d04b777add93adb013124..38c7ee89e02bc2994a7c448340cde87198e56c96 100644
--- a/src/math/armhf/sqrtf.s
+++ b/src/math/armhf/sqrtf.s
@@ -1,3 +1,4 @@
+.syntax unified
 .fpu vfp
 .text
 .global sqrtf
diff --git a/src/setjmp/arm/longjmp.s b/src/setjmp/arm/longjmp.s
index 7db93e8a6837eb3c012d6db3c977207ebd2e5049..e28d8f31c32bec17eb454560a4fbcb50a33e1887 100644
--- a/src/setjmp/arm/longjmp.s
+++ b/src/setjmp/arm/longjmp.s
@@ -1,3 +1,4 @@
+.syntax unified
 .global _longjmp
 .global longjmp
 .type _longjmp,%function
diff --git a/src/setjmp/arm/setjmp.s b/src/setjmp/arm/setjmp.s
index 61425ad5de75b22d1d2aedd796251a80cbe50cb7..87791634b862313f69168c6742fe2e3fa35c5c15 100644
--- a/src/setjmp/arm/setjmp.s
+++ b/src/setjmp/arm/setjmp.s
@@ -1,3 +1,4 @@
+.syntax unified
 .global __setjmp
 .global _setjmp
 .global setjmp
diff --git a/src/signal/arm/restore.s b/src/signal/arm/restore.s
index 18f7216b14ccd69f9c0f0e0e55d97ac28f623ee3..22fb1a54f58eb05a49d9632963a9f124f953d89f 100644
--- a/src/signal/arm/restore.s
+++ b/src/signal/arm/restore.s
@@ -1,3 +1,5 @@
+.syntax unified
+
 .global __restore
 .type __restore,%function
 __restore:
diff --git a/src/signal/arm/sigsetjmp.s b/src/signal/arm/sigsetjmp.s
index 89c020b8eae30e22293ed4683cb5e30cc1ab703e..318addba0a12c29760a371c2253e15f275a2ba0b 100644
--- a/src/signal/arm/sigsetjmp.s
+++ b/src/signal/arm/sigsetjmp.s
@@ -1,3 +1,4 @@
+.syntax unified
 .global sigsetjmp
 .global __sigsetjmp
 .type sigsetjmp,%function
diff --git a/src/thread/arm/__unmapself.s b/src/thread/arm/__unmapself.s
index 62ebb7c18920cc71ca65084d7d9520a48ea0b34b..29c2d07b16604e7bd8a0984030552f8993992b50 100644
--- a/src/thread/arm/__unmapself.s
+++ b/src/thread/arm/__unmapself.s
@@ -1,3 +1,4 @@
+.syntax unified
 .text
 .global __unmapself
 .type   __unmapself,%function
diff --git a/src/thread/arm/clone.s b/src/thread/arm/clone.s
index b7fb788b156d31865420d8fc123f20d0d0797609..fe2e0e60ec4c9e5963fe55d5a940f4028f6c39da 100644
--- a/src/thread/arm/clone.s
+++ b/src/thread/arm/clone.s
@@ -1,3 +1,4 @@
+.syntax unified
 .text
 .global __clone
 .type   __clone,%function
diff --git a/src/thread/arm/syscall_cp.s b/src/thread/arm/syscall_cp.s
index 64528b39a916f8ec082663ab9d8e5658eff80948..a5730c08b826334f550055f31703e1c69227af27 100644
--- a/src/thread/arm/syscall_cp.s
+++ b/src/thread/arm/syscall_cp.s
@@ -1,3 +1,4 @@
+.syntax unified
 .global __cp_begin
 .hidden __cp_begin
 .global __cp_end