diff --git a/builder/frameworks/_bare.py b/builder/frameworks/_bare.py
index f361dd12..5dd183a7 100644
--- a/builder/frameworks/_bare.py
+++ b/builder/frameworks/_bare.py
@@ -23,7 +23,7 @@
 build_mcu = env.get("BOARD_MCU", board.get("build.mcu", ""))
 
 env.Append(
-    ASFLAGS=["-x", "assembler-with-cpp"],
+    ASPPFLAGS=["-x", "assembler-with-cpp"],
 
     CFLAGS=[
         "-std=gnu11"
@@ -83,5 +83,3 @@
         ]
     )
 
-# copy CCFLAGS to ASFLAGS (-x assembler-with-cpp mode)
-env.Append(ASFLAGS=env.get("CCFLAGS", [])[:])
diff --git a/builder/frameworks/arduino/arduino-common.py b/builder/frameworks/arduino/arduino-common.py
index b4a97af8..acf7b289 100644
--- a/builder/frameworks/arduino/arduino-common.py
+++ b/builder/frameworks/arduino/arduino-common.py
@@ -42,20 +42,26 @@
 
 assert os.path.isdir(FRAMEWORK_DIR)
 
+machine_flags = [
+    "-mcpu=%s" % board.get("build.cpu"),
+    "-mthumb",
+]
+
 env.Append(
-    ASFLAGS=["-x", "assembler-with-cpp"],
+    ASFLAGS=machine_flags,
+    ASPPFLAGS=[
+        "-x", "assembler-with-cpp",
+    ],
 
     CFLAGS=[
         "-std=gnu11"
     ],
 
-    CCFLAGS=[
+    CCFLAGS=machine_flags + [
         "-Os",  # optimize for size
         "-ffunction-sections",  # place each function in its own section
         "-fdata-sections",
         "-Wall",
-        "-mcpu=%s" % board.get("build.cpu"),
-        "-mthumb",
         "-nostdlib",
         "--param", "max-inline-insns-single=500"
     ],
@@ -77,10 +83,8 @@
         os.path.join(FRAMEWORK_DIR, "libraries")
     ],
 
-    LINKFLAGS=[
+    LINKFLAGS=machine_flags + [
         "-Os",
-        "-mcpu=%s" % board.get("build.cpu"),
-        "-mthumb",
         "-Wl,--gc-sections",
         "-Wl,--check-sections",
         "-Wl,--unresolved-symbols=report-all",
diff --git a/builder/frameworks/arduino/arduino-sam.py b/builder/frameworks/arduino/arduino-sam.py
index 05bf81c2..dac42d00 100644
--- a/builder/frameworks/arduino/arduino-sam.py
+++ b/builder/frameworks/arduino/arduino-sam.py
@@ -64,10 +64,6 @@
     LIBS=["sam_sam3x8e_gcc_rel", "gcc"]
 )
 
-env.Append(
-    ASFLAGS=env.get("CCFLAGS", [])[:]
-)
-
 #
 # Target: Build Core Library
 #
diff --git a/builder/frameworks/arduino/arduino-samd.py b/builder/frameworks/arduino/arduino-samd.py
index 529279f0..f26241ca 100644
--- a/builder/frameworks/arduino/arduino-samd.py
+++ b/builder/frameworks/arduino/arduino-samd.py
@@ -171,10 +171,6 @@
         ]
     )
 
-env.Append(
-    ASFLAGS=env.get("CCFLAGS", [])[:],
-)
-
 #
 # Target: Build Core Library
 #