diff --git a/libcpu/arm/cortex-m3/cpuport.c b/libcpu/arm/cortex-m3/cpuport.c
index d17d4fdf2e..d58782e2c5 100644
--- a/libcpu/arm/cortex-m3/cpuport.c
+++ b/libcpu/arm/cortex-m3/cpuport.c
@@ -388,13 +388,13 @@ int __rt_ffs(int value)
 {
     __asm volatile(
         "CMP     r0, #0x00            \n"
-        "BEQ     exit                 \n"
+        "BEQ     1f                   \n"
 
         "RBIT    r0, r0               \n"
         "CLZ     r0, r0               \n"
         "ADDS    r0, r0, #0x01        \n"
 
-        "exit:                        \n"
+        "1:                           \n"
 
         : "=r"(value)
         : "r"(value)
diff --git a/libcpu/arm/cortex-m33/cpuport.c b/libcpu/arm/cortex-m33/cpuport.c
index 415f560911..a589ba3462 100644
--- a/libcpu/arm/cortex-m33/cpuport.c
+++ b/libcpu/arm/cortex-m33/cpuport.c
@@ -475,13 +475,13 @@ int __rt_ffs(int value)
 {
     __asm volatile(
         "CMP     r0, #0x00            \n"
-        "BEQ     exit                 \n"
+        "BEQ     1f                   \n"
 
         "RBIT    r0, r0               \n"
         "CLZ     r0, r0               \n"
         "ADDS    r0, r0, #0x01        \n"
 
-        "exit:                        \n"
+        "1:                           \n"
         "BX      lr                   \n"
 
         : "=r"(value)
diff --git a/libcpu/arm/cortex-m4/cpuport.c b/libcpu/arm/cortex-m4/cpuport.c
index f556ba0c26..dc8a9aab59 100644
--- a/libcpu/arm/cortex-m4/cpuport.c
+++ b/libcpu/arm/cortex-m4/cpuport.c
@@ -472,13 +472,13 @@ int __rt_ffs(int value)
 {
     __asm volatile(
         "CMP     r0, #0x00            \n"
-        "BEQ     exit                 \n"
+        "BEQ     1f                   \n"
 
         "RBIT    r0, r0               \n"
         "CLZ     r0, r0               \n"
         "ADDS    r0, r0, #0x01        \n"
 
-        "exit:                        \n"
+        "1:                           \n"
 
         : "=r"(value)
         : "r"(value)
diff --git a/libcpu/arm/cortex-m7/cpuport.c b/libcpu/arm/cortex-m7/cpuport.c
index c22242f140..e701a52307 100644
--- a/libcpu/arm/cortex-m7/cpuport.c
+++ b/libcpu/arm/cortex-m7/cpuport.c
@@ -472,13 +472,13 @@ int __rt_ffs(int value)
 {
     __asm volatile(
         "CMP     r0, #0x00            \n"
-        "BEQ     exit                 \n"
+        "BEQ     1f                   \n"
 
         "RBIT    r0, r0               \n"
         "CLZ     r0, r0               \n"
         "ADDS    r0, r0, #0x01        \n"
 
-        "exit:                        \n"
+        "1:                           \n"
 
         : "=r"(value)
         : "r"(value)