diff --git a/platformio/builder/scripts/basearm.py b/platformio/builder/scripts/basearm.py
index 0143b658..34946dd2 100644
--- a/platformio/builder/scripts/basearm.py
+++ b/platformio/builder/scripts/basearm.py
@@ -33,7 +33,7 @@ env.Replace(
 
     ASFLAGS=[
         "-x", "assembler-with-cpp",
-        "$CCFLAGS"
+        env.subst("$CCFLAGS")
     ],
 
     CCFLAGS=[
diff --git a/platformio/builder/scripts/baseavr.py b/platformio/builder/scripts/baseavr.py
index c2230ad1..6645336a 100644
--- a/platformio/builder/scripts/baseavr.py
+++ b/platformio/builder/scripts/baseavr.py
@@ -33,7 +33,7 @@ env.Replace(
 
     ASFLAGS=[
         "-x", "assembler-with-cpp",
-        "$CCFLAGS"
+        env.subst("$CCFLAGS")
     ],
 
     CCFLAGS=[
diff --git a/platformio/builder/scripts/espressif.py b/platformio/builder/scripts/espressif.py
index 1985d411..79e6ebcb 100644
--- a/platformio/builder/scripts/espressif.py
+++ b/platformio/builder/scripts/espressif.py
@@ -66,7 +66,7 @@ env.Replace(
 
     ASFLAGS=[
         "-x", "assembler-with-cpp",
-        "$CCFLAGS"
+        env.subst("$CCFLAGS")
     ],
 
     CFLAGS=[
diff --git a/platformio/builder/scripts/timsp430.py b/platformio/builder/scripts/timsp430.py
index d90f431e..a565a9c8 100644
--- a/platformio/builder/scripts/timsp430.py
+++ b/platformio/builder/scripts/timsp430.py
@@ -38,7 +38,7 @@ env.Replace(
 
     ASFLAGS=[
         "-x", "assembler-with-cpp",
-        "$CCFLAGS"
+        env.subst("$CCFLAGS")
     ],
 
     CCFLAGS=[