diff --git a/targets/TARGET_ARM_SSG/TARGET_MUSCA_A1/TARGET_MUSCA_A1_S/device/TOOLCHAIN_ARMC6/musca_s.sct b/targets/TARGET_ARM_SSG/TARGET_MUSCA_A1/TARGET_MUSCA_A1_S/device/TOOLCHAIN_ARMC6/musca_s.sct
index 4793dcaf56..245773f38f 100644
--- a/targets/TARGET_ARM_SSG/TARGET_MUSCA_A1/TARGET_MUSCA_A1_S/device/TOOLCHAIN_ARMC6/musca_s.sct
+++ b/targets/TARGET_ARM_SSG/TARGET_MUSCA_A1/TARGET_MUSCA_A1_S/device/TOOLCHAIN_ARMC6/musca_s.sct
@@ -37,7 +37,7 @@
 #endif
 
 #if !defined(MBED_RAM_SIZE)
-  #define MBED_RAM_SIZE     S_DATA_SIZE     // 0x10000
+  #define MBED_RAM_SIZE     S_DATA_SIZE     // 0x11000
 #endif
 
 LR_CODE MBED_ROM_START MBED_ROM_SIZE {
diff --git a/targets/TARGET_ARM_SSG/TARGET_MUSCA_A1/partition/region_defs.h b/targets/TARGET_ARM_SSG/TARGET_MUSCA_A1/partition/region_defs.h
index 3534430250..16ae45829d 100644
--- a/targets/TARGET_ARM_SSG/TARGET_MUSCA_A1/partition/region_defs.h
+++ b/targets/TARGET_ARM_SSG/TARGET_MUSCA_A1/partition/region_defs.h
@@ -99,7 +99,7 @@
 /* Increase secure DATA area to run the regression tests on Musca A1 */
 #define S_DATA_SIZE     ((TOTAL_RAM_SIZE / 4) * 3)
 #else
-#define S_DATA_SIZE     (TOTAL_RAM_SIZE / 2)
+#define S_DATA_SIZE     ((TOTAL_RAM_SIZE / 2) + 0x1000)
 #endif
 
 #define S_DATA_LIMIT    (S_DATA_START + S_DATA_SIZE - 1)
diff --git a/targets/targets.json b/targets/targets.json
index a22fb41dec..dafbfddfe7 100644
--- a/targets/targets.json
+++ b/targets/targets.json
@@ -5454,8 +5454,8 @@
         "overrides": {
             "non-secure-rom-start": "0x000a0400",
             "non-secure-rom-size": "0x5f800",
-            "non-secure-ram-start": "0x20010170",
-            "non-secure-ram-size": "0xfe90"
+            "non-secure-ram-start": "0x20011170",
+            "non-secure-ram-size": "0xee90"
         }
     },
     "ARM_MUSCA_A1_S": {
@@ -5479,7 +5479,7 @@
             "secure-rom-start": "0x10020400",
             "secure-rom-size": "0x7f800",
             "secure-ram-start": "0x30000000",
-            "secure-ram-size": "0x10000"
+            "secure-ram-size": "0x11000"
         }
     },
     "RZ_A1XX": {