diff --git a/arch/arm/src/armv7-m/up_testset.S b/arch/arm/src/armv7-m/up_testset.S
index 3f550951d4f..c7be199bb75 100644
--- a/arch/arm/src/armv7-m/up_testset.S
+++ b/arch/arm/src/armv7-m/up_testset.S
@@ -105,7 +105,7 @@ up_testset:
 	/* Not locked ... attempt to lock it */
 
 	strexb	r2, r1, [r0]		/* Attempt to set the locked state */
-	cmp		r2, r1				/* r2 will be 1 is strexb succeeded */
+	cmp		r2, r1				/* r2 will be 1 is strexb failed */
 	beq		1b					/* Failed to lock... try again */
 
 	/* Lock acquired -- return SP_UNLOCKED */
diff --git a/arch/arm/src/armv7-r/arm_testset.S b/arch/arm/src/armv7-r/arm_testset.S
index fa8e8e4174a..7cd741fed73 100644
--- a/arch/arm/src/armv7-r/arm_testset.S
+++ b/arch/arm/src/armv7-r/arm_testset.S
@@ -103,7 +103,7 @@ up_testset:
 	/* Not locked ... attempt to lock it */
 
 	strexb	r2, r1, [r0]		/* Attempt to set the locked state */
-	cmp		r2, r1				/* r2 will be 1 is strexb succeeded */
+	cmp		r2, r1				/* r2 will be 1 is strexb failed */
 	beq		1b					/* Failed to lock... try again */
 
 	/* Lock acquired -- return SP_UNLOCKED */