diff --git a/Makefile b/Makefile
index 6c232f2..c22320b 100644
--- a/Makefile
+++ b/Makefile
@@ -15,7 +15,7 @@ FORMATS += RawFloat
 FORMATS += Binary
 FORMATS += Checksum
 FORMATS += Regexp
-FORMATS += Exponential
+FORMATS += MantissaExponent
 RECORDTYPES += aai aao
 RECORDTYPES += ao ai
 RECORDTYPES += bo bi