diff --git a/admin/sync/exercice_files.go b/admin/sync/exercice_files.go
index 90308cc8..06e1f3a6 100644
--- a/admin/sync/exercice_files.go
+++ b/admin/sync/exercice_files.go
@@ -1,6 +1,7 @@
 package sync
 
 import (
+	"compress/gzip"
 	"encoding/hex"
 	"fmt"
 	"log"
@@ -120,6 +121,25 @@ func CheckExerciceFiles(i Importer, exercice *fic.Exercice, exceptions *CheckExc
 				if strings.HasSuffix(fname, ".gz") {
 					if d, exists := digests[strings.TrimSuffix(fname, ".gz")]; exists {
 						digest_shown = d
+
+						// Check that gunzipped file digest is correct
+						if fd, closer, err := GetFile(i, path.Join(exercice.Path, "files", fname)); err != nil {
+							errs = append(errs, NewFileError(exercice, fname, fmt.Errorf("unable to read file: %w", err)))
+							continue
+						} else if gunzipfd, err := gzip.NewReader(fd); err != nil {
+							closer()
+							errs = append(errs, NewFileError(exercice, fname, fmt.Errorf("unable to gunzip file: %w", err)))
+							continue
+						} else {
+							defer gunzipfd.Close()
+							defer closer()
+
+							hash160_inflate, hash512_inflate := fic.CreateHashBuffers(gunzipfd)
+
+							if _, err := fic.CheckBufferHash(hash160_inflate, hash512_inflate, digest_shown); err != nil {
+								errs = append(errs, NewFileError(exercice, strings.TrimSuffix(fname, ".gz"), err))
+							}
+						}
 					}
 				}