diff --git a/lib/galaxy/datatypes/binary.py b/lib/galaxy/datatypes/binary.py
index 21156a9fa47..a8d5d73d7b1 100644
--- a/lib/galaxy/datatypes/binary.py
+++ b/lib/galaxy/datatypes/binary.py
@@ -957,7 +957,7 @@ class Trr(GmxBinary):
     """
 
     file_ext = "trr"
-    magic_number = 1993  # magic number reference: https://github.com/gromacs/gromacs/blob/master/src/gromacs/fileio/trrio.cpp
+    magic_number = 1993  # magic number reference: https://github.com/gromacs/gromacs/blob/cec211b2c835ba6e8ea849fb1bf67d7fc19693a4/src/gromacs/fileio/trrio.cpp
 
 
 class Cpt(GmxBinary):
@@ -974,7 +974,7 @@ class Cpt(GmxBinary):
     """
 
     file_ext = "cpt"
-    magic_number = 171817  # magic number reference: https://github.com/gromacs/gromacs/blob/master/src/gromacs/fileio/checkpoint.cpp
+    magic_number = 171817  # magic number reference: https://github.com/gromacs/gromacs/blob/cec211b2c835ba6e8ea849fb1bf67d7fc19693a4/src/gromacs/fileio/checkpoint.cpp
 
 
 class Xtc(GmxBinary):
@@ -991,7 +991,7 @@ class Xtc(GmxBinary):
     """
 
     file_ext = "xtc"
-    magic_number = 1995  # reference: https://github.com/gromacs/gromacs/blob/master/src/gromacs/fileio/xtcio.cpp
+    magic_number = 1995  # reference: https://github.com/gromacs/gromacs/blob/cec211b2c835ba6e8ea849fb1bf67d7fc19693a4/src/gromacs/fileio/xtcio.cpp
 
 
 class Edr(GmxBinary):
@@ -1008,7 +1008,7 @@ class Edr(GmxBinary):
     """
 
     file_ext = "edr"
-    magic_number = -55555  # reference: https://github.com/gromacs/gromacs/blob/master/src/gromacs/fileio/enxio.cpp
+    magic_number = -55555  # reference: https://github.com/gromacs/gromacs/blob/cec211b2c835ba6e8ea849fb1bf67d7fc19693a4/src/gromacs/fileio/enxio.cpp
 
 
 class Biom2(H5):