diff --git a/builder/frameworks/_bare.py b/builder/frameworks/_bare.py
index 5db4a07..6cb23ea 100644
--- a/builder/frameworks/_bare.py
+++ b/builder/frameworks/_bare.py
@@ -21,7 +21,12 @@ from SCons.Script import Import
 Import("env")
 
 env.Append(
-    ASFLAGS=["-x", "assembler-with-cpp"],
+    ASFLAGS=[
+        "-mlongcalls",
+    ],
+    ASPPFLAGS=[
+        "-x", "assembler-with-cpp",
+    ],
 
     CFLAGS=["-std=gnu99"],
 
@@ -60,6 +65,3 @@ env.Append(
         "-Wl,--gc-sections"
     ]
 )
-
-# copy CCFLAGS to ASFLAGS (-x assembler-with-cpp mode)
-env.Append(ASFLAGS=env.get("CCFLAGS", [])[:])
diff --git a/builder/main.py b/builder/main.py
index 12b48b9..19d88b3 100644
--- a/builder/main.py
+++ b/builder/main.py
@@ -227,9 +227,6 @@ if env.get("PROGNAME", "program") == "program":
     env.Replace(PROGNAME="firmware")
 
 env.Append(
-    # copy CCFLAGS to ASFLAGS (-x assembler-with-cpp mode)
-    ASFLAGS=env.get("CCFLAGS", [])[:],
-
     BUILDERS=dict(
         ElfToBin=Builder(
             action=env.VerboseAction(" ".join([