diff --git a/configs/sam4e-ek/nsh/Make.defs b/configs/sam4e-ek/nsh/Make.defs
index 6901dba7cb..88093d81c3 100644
--- a/configs/sam4e-ek/nsh/Make.defs
+++ b/configs/sam4e-ek/nsh/Make.defs
@@ -75,7 +75,7 @@ endif
 
 ARCHCFLAGS = -fno-builtin
 ARCHCXXFLAGS = -fno-builtin -fno-exceptions -fno-rtti
-ARCHWARNINGS = -Wall -Wstrict-prototypes -Wshadow
+ARCHWARNINGS = -Wall -Wstrict-prototypes -Wshadow -fno-strict-aliasing
 ARCHWARNINGSXX = -Wall -Wshadow
 ARCHDEFINES =
 ARCHPICFLAGS = -fpic -msingle-pic-base -mpic-register=r10
diff --git a/configs/sam4e-ek/nxwm/Make.defs b/configs/sam4e-ek/nxwm/Make.defs
index 744cc0aa31..021af01ae7 100644
--- a/configs/sam4e-ek/nxwm/Make.defs
+++ b/configs/sam4e-ek/nxwm/Make.defs
@@ -75,7 +75,7 @@ endif
 
 ARCHCFLAGS = -fno-builtin
 ARCHCXXFLAGS = -fno-builtin -fno-exceptions -fno-rtti
-ARCHWARNINGS = -Wall -Wstrict-prototypes -Wshadow
+ARCHWARNINGS = -Wall -Wstrict-prototypes -Wshadow -fno-strict-aliasing
 ARCHWARNINGSXX = -Wall -Wshadow
 ARCHDEFINES =
 ARCHPICFLAGS = -fpic -msingle-pic-base -mpic-register=r10
diff --git a/configs/sam4e-ek/usbnsh/Make.defs b/configs/sam4e-ek/usbnsh/Make.defs
index 4e1a5ac40d..51c8492eba 100644
--- a/configs/sam4e-ek/usbnsh/Make.defs
+++ b/configs/sam4e-ek/usbnsh/Make.defs
@@ -75,7 +75,7 @@ endif
 
 ARCHCFLAGS = -fno-builtin
 ARCHCXXFLAGS = -fno-builtin -fno-exceptions -fno-rtti
-ARCHWARNINGS = -Wall -Wstrict-prototypes -Wshadow
+ARCHWARNINGS = -Wall -Wstrict-prototypes -Wshadow -fno-strict-aliasing
 ARCHWARNINGSXX = -Wall -Wshadow
 ARCHDEFINES =
 ARCHPICFLAGS = -fpic -msingle-pic-base -mpic-register=r10