diff --git a/Changelog.txt b/Changelog.txt
index 60798d2a9..c4e6a8fe2 100644
--- a/Changelog.txt
+++ b/Changelog.txt
@@ -22,6 +22,7 @@ common:
 x86/x86_64:
 	* Fixed #28 a wrong result of dsdot on x86_64.
 	* Fixed #32 a SEGFAULT bug of zdotc with gcc-4.6.
+	* Fixed #33 ztrmm bug on Nehalem.
 
 MIPS64:
 	* Fixed #28 a wrong result of dsdot on Loongson3A/MIPS64. 
diff --git a/kernel/x86_64/zgemm_kernel_1x4_nehalem.S b/kernel/x86_64/zgemm_kernel_1x4_nehalem.S
index e72a19c96..4ddfc488b 100644
--- a/kernel/x86_64/zgemm_kernel_1x4_nehalem.S
+++ b/kernel/x86_64/zgemm_kernel_1x4_nehalem.S
@@ -544,7 +544,7 @@
 	jg	.L11
 
 #if defined(TRMMKERNEL) && !defined(LEFT)
-	addq	$1, KK
+	addq	$4, KK
 #endif
 
 	leaq	(C, LDC, 4), C
@@ -594,7 +594,7 @@
 	jg	.L11
 
 #if defined(TRMMKERNEL) && !defined(LEFT)
-	addq	$1, KK
+	addq	$4, KK
 #endif
 
 	leaq	(C, LDC, 4), C