diff --git a/docs/design/cpu-specific-build-macros.rst b/docs/design/cpu-specific-build-macros.rst
index 73c7ac5..0f1f92a 100644
--- a/docs/design/cpu-specific-build-macros.rst
+++ b/docs/design/cpu-specific-build-macros.rst
@@ -353,6 +353,10 @@
   Cortex-A78C CPU. This needs to be enabled for revision r0p0. The erratum is
   fixed in r0p1.
 
+- ``ERRATA_A78C_1827440`` : This applies errata 1827440 workaround to
+  Cortex-A78C CPU. This needs to be enabled for revision r0p0. The erratum is
+  fixed in r0p1.
+
 - ``ERRATA_A78C_2132064`` : This applies errata 2132064 workaround to
   Cortex-A78C CPU. This needs to be enabled for revisions r0p1, r0p2 and
   it is still open.
diff --git a/lib/cpus/aarch64/cortex_a78c.S b/lib/cpus/aarch64/cortex_a78c.S
index 88bd291..fddd24f 100644
--- a/lib/cpus/aarch64/cortex_a78c.S
+++ b/lib/cpus/aarch64/cortex_a78c.S
@@ -45,6 +45,33 @@
 endfunc check_errata_1827430
 
 /* --------------------------------------------------
+ * Errata Workaround for A78C Erratum 1827440.
+ * This applies to revision r0p0 of the Cortex A78C
+ * processor and is fixed in r0p1.
+ * x0: variant[4:7] and revision[0:3] of current cpu.
+ * Shall clobber: x0-x17
+ * --------------------------------------------------
+ */
+func errata_a78c_1827440_wa
+	mov	x17, x30
+	bl	check_errata_1827440
+	cbz	x0, 1f
+
+	/* Force Atomic Store to WB memory be done in L1 data cache */
+	mrs	x1, CORTEX_A78C_CPUACTLR2_EL1
+	orr	x1, x1, #BIT(2)
+	msr	CORTEX_A78C_CPUACTLR2_EL1, x1
+1:
+	ret	x17
+endfunc errata_a78c_1827440_wa
+
+func check_errata_1827440
+	/* Applies to revision r0p0 only */
+	mov	x1, #0x00
+	b	cpu_rev_var_ls
+endfunc check_errata_1827440
+
+/* --------------------------------------------------
  * Errata Workaround for Cortex A78C Erratum 2376749.
  * This applies to revision r0p1 and r0p2 of the A78C
  * and is currently open. It is a Cat B erratum.
@@ -257,6 +284,11 @@
 	bl	errata_a78c_1827430_wa
 #endif
 
+#if ERRATA_A78C_1827440
+	mov	x0, x18
+	bl	errata_a78c_1827440_wa
+#endif
+
 #if ERRATA_A78C_2132064
 	mov	x0, x18
 	bl	errata_a78c_2132064_wa
@@ -332,6 +364,7 @@
 	 * checking functions of each errata.
 	 */
 	report_errata ERRATA_A78C_1827430, cortex_a78c, 1827430
+	report_errata ERRATA_A78C_1827440, cortex_a78c, 1827440
 	report_errata ERRATA_A78C_2132064, cortex_a78c, 2132064
 	report_errata ERRATA_A78C_2242638, cortex_a78c, 2242638
 	report_errata ERRATA_A78C_2376749, cortex_a78c, 2376749
diff --git a/lib/cpus/cpu-ops.mk b/lib/cpus/cpu-ops.mk
index 13cf508..82a4890 100644
--- a/lib/cpus/cpu-ops.mk
+++ b/lib/cpus/cpu-ops.mk
@@ -358,6 +358,10 @@
 # to revision r0p0 of the A78C cpu. It is fixed in r0p1.
 CPU_FLAG_LIST += ERRATA_A78C_1827430
 
+# Flag to apply erratum 1827440 workaround during reset. This erratum applies
+# to revision r0p0 of the A78C cpu. It is fixed in r0p1.
+CPU_FLAG_LIST += ERRATA_A78C_1827440
+
 # Flag to apply erratum 2132064 workaround during reset. This erratum applies
 # to revisions r0p1 and r0p2 of the A78C cpu. It is still open.
 CPU_FLAG_LIST += ERRATA_A78C_2132064