diff --git a/scripts/fbt/util.py b/scripts/fbt/util.py
index ae850a8c..57e60aec 100644
--- a/scripts/fbt/util.py
+++ b/scripts/fbt/util.py
@@ -59,7 +59,9 @@ def extract_abs_dir_path(node):
     if abs_dir_node is None:
         raise StopError(f"Can't find absolute path for {node.name}")
 
-    return abs_dir_node.abspath
+    # Don't return abspath attribute (type is str), it will break in
+    # OverrideEnvironment.subst_list() by splitting path on spaces
+    return abs_dir_node
 
 
 def path_as_posix(path):
diff --git a/scripts/fbt_tools/fbt_assets.py b/scripts/fbt_tools/fbt_assets.py
index 68617c25..b2b9310b 100644
--- a/scripts/fbt_tools/fbt_assets.py
+++ b/scripts/fbt_tools/fbt_assets.py
@@ -137,14 +137,14 @@ def generate(env):
         BUILDERS={
             "IconBuilder": Builder(
                 action=Action(
-                    '${PYTHON3} "${ASSETS_COMPILER}" icons "${ABSPATHGETTERFUNC(SOURCE)}" "${TARGET.dir}" --filename ${ICON_FILE_NAME}',
+                    '${PYTHON3} ${ASSETS_COMPILER} icons ${ABSPATHGETTERFUNC(SOURCE)} ${TARGET.dir} --filename "${ICON_FILE_NAME}"',
                     "${ICONSCOMSTR}",
                 ),
                 emitter=icons_emitter,
             ),
             "ProtoBuilder": Builder(
                 action=Action(
-                    '${PYTHON3} "${NANOPB_COMPILER}" -q -I${SOURCE.dir.posix} -D${TARGET.dir.posix} ${SOURCES.posix}',
+                    "${PYTHON3} ${NANOPB_COMPILER} -q -I${SOURCE.dir.posix} -D${TARGET.dir.posix} ${SOURCES.posix}",
                     "${PROTOCOMSTR}",
                 ),
                 emitter=proto_emitter,
@@ -153,14 +153,14 @@ def generate(env):
             ),
             "DolphinSymBuilder": Builder(
                 action=Action(
-                    '${PYTHON3} "${ASSETS_COMPILER}" dolphin -s dolphin_${DOLPHIN_RES_TYPE} "${SOURCE}" "${_DOLPHIN_OUT_DIR}"',
+                    "${PYTHON3} ${ASSETS_COMPILER} dolphin -s dolphin_${DOLPHIN_RES_TYPE} ${SOURCE} ${_DOLPHIN_OUT_DIR}",
                     "${DOLPHINCOMSTR}",
                 ),
                 emitter=dolphin_emitter,
             ),
             "DolphinExtBuilder": Builder(
                 action=Action(
-                    '${PYTHON3} "${ASSETS_COMPILER}" dolphin "${SOURCE}" "${_DOLPHIN_OUT_DIR}"',
+                    "${PYTHON3} ${ASSETS_COMPILER} dolphin ${SOURCE} ${_DOLPHIN_OUT_DIR}",
                     "${DOLPHINCOMSTR}",
                 ),
                 emitter=dolphin_emitter,