diff --git a/lib/libc/amd64/sys/cerror.S b/lib/libc/amd64/sys/cerror.S
index ffce9d56199..1928acd0b7a 100644
--- a/lib/libc/amd64/sys/cerror.S
+++ b/lib/libc/amd64/sys/cerror.S
@@ -43,7 +43,7 @@ __FBSDID("$FreeBSD$");
 
 	/*
 	 * The __error() function is thread aware. For non-threaded
-	 * programs and the initial threaded in threaded programs,
+	 * programs and the initial thread in threaded programs,
 	 * it returns a pointer to the global errno variable.
 	 */
 	.globl	CNAME(__error)
diff --git a/lib/libc/i386/sys/cerror.S b/lib/libc/i386/sys/cerror.S
index 423d716cb65..47bd0fade00 100644
--- a/lib/libc/i386/sys/cerror.S
+++ b/lib/libc/i386/sys/cerror.S
@@ -43,7 +43,7 @@ __FBSDID("$FreeBSD$");
 
 	/*
 	 * The __error() function is thread aware. For non-threaded
-	 * programs and the initial threaded in threaded programs,
+	 * programs and the initial thread in threaded programs,
 	 * it returns a pointer to the global errno variable.
 	 */
 	.globl	CNAME(__error)
diff --git a/lib/libc/powerpc/sys/cerror.S b/lib/libc/powerpc/sys/cerror.S
index c2bc994b9c3..9ec3cbaf63a 100644
--- a/lib/libc/powerpc/sys/cerror.S
+++ b/lib/libc/powerpc/sys/cerror.S
@@ -35,7 +35,7 @@ __FBSDID("$FreeBSD$");
 
 	/*
 	 * The __error() function is thread aware. For non-threaded
-	 * programs and the initial threaded in threaded programs,
+	 * programs and the initial thread in threaded programs,
 	 * it returns a pointer to the global errno variable.
 	 */
 HIDENAME(cerror):
diff --git a/lib/libc/powerpc64/sys/cerror.S b/lib/libc/powerpc64/sys/cerror.S
index 3362c9fdf04..93172fdb822 100644
--- a/lib/libc/powerpc64/sys/cerror.S
+++ b/lib/libc/powerpc64/sys/cerror.S
@@ -35,7 +35,7 @@ __FBSDID("$FreeBSD$");
 
 	/*
 	 * The __error() function is thread aware. For non-threaded
-	 * programs and the initial threaded in threaded programs,
+	 * programs and the initial thread in threaded programs,
 	 * it returns a pointer to the global errno variable.
 	 */
 ENTRY_NOPROF(HIDENAME(cerror))