diff --git a/lib/fsk4hf/bpdecode174_91.f90 b/lib/fsk4hf/bpdecode174_91.f90
index 16fac52a3..6280dcaec 100644
--- a/lib/fsk4hf/bpdecode174_91.f90
+++ b/lib/fsk4hf/bpdecode174_91.f90
@@ -17,8 +17,8 @@ real llr(N)
 real Tmn
 integer nrw(M),ncw
 
-include "ldpc_174_91_a_colorder.f90"
-include "ldpc_174_91_a_parity.f90"
+include "ldpc_174_91_c_colorder.f90"
+include "ldpc_174_91_c_parity.f90"
 
 decoded=0
 toc=0
diff --git a/lib/fsk4hf/encode174_91.f90 b/lib/fsk4hf/encode174_91.f90
index 8003afb08..355a3ad90 100644
--- a/lib/fsk4hf/encode174_91.f90
+++ b/lib/fsk4hf/encode174_91.f90
@@ -12,8 +12,8 @@ integer*1 itmp(N)
 integer*1 message(K)
 integer*1 pchecks(M)
 integer colorder(N)
-include "ldpc_174_91_a_generator.f90"
-include "ldpc_174_91_a_colorder.f90"
+include "ldpc_174_91_c_generator.f90"
+include "ldpc_174_91_c_colorder.f90"
 logical first
 data first/.true./
 save first,gen
diff --git a/lib/fsk4hf/ldpcsim174_91.f90 b/lib/fsk4hf/ldpcsim174_91.f90
index 39b0e6b32..bdb16ac42 100644
--- a/lib/fsk4hf/ldpcsim174_91.f90
+++ b/lib/fsk4hf/ldpcsim174_91.f90
@@ -19,7 +19,7 @@ logical checksumok
 real*8, allocatable ::  rxdata(:)
 real, allocatable :: llr(:)
 
-include "ldpc_174_91_a_colorder.f90"
+include "ldpc_174_91_c_colorder.f90"
 
 nerrtot=0
 nerrdec=0
diff --git a/lib/fsk4hf/osd174_91.f90 b/lib/fsk4hf/osd174_91.f90
index 7109ba527..38b5e69ba 100644
--- a/lib/fsk4hf/osd174_91.f90
+++ b/lib/fsk4hf/osd174_91.f90
@@ -15,8 +15,8 @@ integer*1 decoded(K)
 integer indx(N)
 real llr(N),rx(N),absrx(N)
 
-include "ldpc_174_91_a_generator.f90"
-include "ldpc_174_91_a_colorder.f90"
+include "ldpc_174_91_c_generator.f90"
+include "ldpc_174_91_c_colorder.f90"
 
 logical first,reset
 data first/.true./