diff --git a/targets/TARGET_Maxim/TARGET_MAX32600/device/TOOLCHAIN_GCC_ARM/startup_max32600.S b/targets/TARGET_Maxim/TARGET_MAX32600/device/TOOLCHAIN_GCC_ARM/startup_max32600.S
index 227ecb3565..31af57d315 100644
--- a/targets/TARGET_Maxim/TARGET_MAX32600/device/TOOLCHAIN_GCC_ARM/startup_max32600.S
+++ b/targets/TARGET_Maxim/TARGET_MAX32600/device/TOOLCHAIN_GCC_ARM/startup_max32600.S
@@ -51,7 +51,7 @@
 #ifdef __STACK_SIZE
     .equ    Stack_Size, __STACK_SIZE
 #else
-    .equ    Stack_Size, 0x00001000
+    .equ    Stack_Size, 0x00000800
 #endif
     .globl    __StackTop
     .globl    __StackLimit
@@ -66,7 +66,7 @@ __StackTop:
 #ifdef __HEAP_SIZE
     .equ    Heap_Size, __HEAP_SIZE
 #else
-    .equ    Heap_Size, 0x00004000
+    .equ    Heap_Size, 0x00003000
 #endif
     .globl    __HeapBase
     .globl    __HeapLimit
diff --git a/targets/TARGET_Maxim/TARGET_MAX32600/device/TOOLCHAIN_IAR/MAX32600.icf b/targets/TARGET_Maxim/TARGET_MAX32600/device/TOOLCHAIN_IAR/MAX32600.icf
index 3e0cd5e85f..96d5c1555b 100644
--- a/targets/TARGET_Maxim/TARGET_MAX32600/device/TOOLCHAIN_IAR/MAX32600.icf
+++ b/targets/TARGET_Maxim/TARGET_MAX32600/device/TOOLCHAIN_IAR/MAX32600.icf
@@ -15,8 +15,8 @@ define region ROM_region      = mem:[from __region_ROM_start__   to __region_ROM
 define region RAM_region      = mem:[from __region_RAM_start__   to __region_RAM_end__];
 
 /* Stack and Heap */
-define symbol __size_cstack__ = 0x1000;
-define symbol __size_heap__   = 0x4000;
+define symbol __size_cstack__ = 0x0800;
+define symbol __size_heap__   = 0x3000;
 define block CSTACK    with alignment = 8, size = __size_cstack__   { };
 define block HEAP      with alignment = 8, size = __size_heap__     { };
 
diff --git a/targets/TARGET_Maxim/TARGET_MAX32620/device/TOOLCHAIN_GCC_ARM/startup_max32620.S b/targets/TARGET_Maxim/TARGET_MAX32620/device/TOOLCHAIN_GCC_ARM/startup_max32620.S
index 12006b3247..d844878c8b 100644
--- a/targets/TARGET_Maxim/TARGET_MAX32620/device/TOOLCHAIN_GCC_ARM/startup_max32620.S
+++ b/targets/TARGET_Maxim/TARGET_MAX32620/device/TOOLCHAIN_GCC_ARM/startup_max32620.S
@@ -51,7 +51,7 @@
 #ifdef __STACK_SIZE
     .equ    Stack_Size, __STACK_SIZE
 #else
-    .equ    Stack_Size, 0x00002000
+    .equ    Stack_Size, 0x00001000
 #endif
     .globl    __StackTop
     .globl    __StackLimit
diff --git a/targets/TARGET_Maxim/TARGET_MAX32620/device/TOOLCHAIN_IAR/MAX32620.icf b/targets/TARGET_Maxim/TARGET_MAX32620/device/TOOLCHAIN_IAR/MAX32620.icf
index 203c221868..7edf37819c 100644
--- a/targets/TARGET_Maxim/TARGET_MAX32620/device/TOOLCHAIN_IAR/MAX32620.icf
+++ b/targets/TARGET_Maxim/TARGET_MAX32620/device/TOOLCHAIN_IAR/MAX32620.icf
@@ -15,7 +15,7 @@ define region ROM_region      = mem:[from __region_ROM_start__   to __region_ROM
 define region RAM_region      = mem:[from __region_RAM_start__   to __region_RAM_end__];
 
 /* Stack and Heap */
-define symbol __size_cstack__ = 0x2000;
+define symbol __size_cstack__ = 0x1000;
 define symbol __size_heap__   = 0x4000;
 define block CSTACK    with alignment = 8, size = __size_cstack__   { };
 define block HEAP      with alignment = 8, size = __size_heap__     { };