diff --git a/csdr/chain/acarsdec.py b/csdr/chain/acarsdec.py
index 8ece09f2..b62da087 100644
--- a/csdr/chain/acarsdec.py
+++ b/csdr/chain/acarsdec.py
@@ -1,3 +1,4 @@
+from pycsdr.modules import AmDemod
 from owrx.acars.acarsdec import AcarsDecModule
 from csdr.chain.demodulator import ServiceDemodulator
 from csdr.module import JsonParser
@@ -6,6 +7,7 @@ from csdr.module import JsonParser
 class AcarsDec(ServiceDemodulator):
     def __init__(self):
         super().__init__([
+            AmDemod(),
             AcarsDecModule(),
             JsonParser("ACARS"),
         ])
diff --git a/owrx/acars/acarsdec.py b/owrx/acars/acarsdec.py
index 5a2463f3..67e291c4 100644
--- a/owrx/acars/acarsdec.py
+++ b/owrx/acars/acarsdec.py
@@ -5,7 +5,7 @@ from pycsdr.types import Format
 class AcarsDecModule(ExecModule):
     def __init__(self):
         super().__init__(
-            Format.COMPLEX_FLOAT,
+            Format.FLOAT,
             Format.CHAR,
             ["acarsdec", "-s", "-o", "4"]
         )