diff --git a/test-app/ARM-stm32h5-ns.ld b/test-app/ARM-stm32h5-ns.ld
index b8d71337..73551437 100644
--- a/test-app/ARM-stm32h5-ns.ld
+++ b/test-app/ARM-stm32h5-ns.ld
@@ -50,5 +50,5 @@ SECTIONS
 }
 
 PROVIDE(_start_heap = _end);
-PROVIDE(_heap_size = 4K);
+PROVIDE(_heap_size = 8K);
 PROVIDE(_end_stack  = ORIGIN(RAM) + LENGTH(RAM));
diff --git a/test-app/ARM-stm32h5.ld b/test-app/ARM-stm32h5.ld
index a225a39a..f6001569 100644
--- a/test-app/ARM-stm32h5.ld
+++ b/test-app/ARM-stm32h5.ld
@@ -50,5 +50,5 @@ SECTIONS
 }
 
 PROVIDE(_start_heap = _end);
-PROVIDE(_heap_size = 4K);
+PROVIDE(_heap_size = 8K);
 PROVIDE(_end_stack  = ORIGIN(RAM) + LENGTH(RAM));
diff --git a/test-app/Makefile b/test-app/Makefile
index 5d35498b..3b232f7b 100644
--- a/test-app/Makefile
+++ b/test-app/Makefile
@@ -114,7 +114,8 @@ ifeq ($(TZEN),1)
             APP_OBJS+=./wcs/wc_encrypt.o
             APP_OBJS+=./wcs/wc_port.o
         endif
-        CFLAGS+=-DWOLFBOOT_SECURE_CALLS -Wstack-usage=12944
+        CFLAGS+=-DWOLFBOOT_SECURE_CALLS -Wstack-usage=19184
+        LDFLAGS+=--specs=nosys.specs -u _printf_float
     endif
 else
     APP_OBJS+=../hal/$(TARGET).o