use ‘.. code-block:: c’ (three instances)

1 files changed, 3 insertions, 3 deletions

diff --git a/taler-exchange-manual.rst b/taler-exchange-manual.rst
index 4d19709e..e68bdf8f 100644
--- a/taler-exchange-manual.rst
+++ b/taler-exchange-manual.rst
@@ -850,7 +850,7 @@ starting time at which the signing key can be used in microseconds since
 the Epoch. The file format is defined by the struct
 TALER_EXCHANGEDB_PrivateSigningKeyInformationP:
 
-::
+.. code-block:: c
 
    struct TALER_EXCHANGEDB_PrivateSigningKeyInformationP {
       struct TALER_ExchangePrivateKeyP signkey_priv;
@@ -883,7 +883,7 @@ struct TALER_EXCHANGEDB_DenominationKeyInformationP giving the
 attributes of the denomination key and the associated signature with the
 exchange’s long-term offline key:
 
-::
+.. code-block:: c
 
    struct TALER_EXCHANGEDB_DenominationKeyInformationP {
      struct TALER_MasterSignatureP signature;
@@ -940,7 +940,7 @@ Each file must contain a header with the public key information of the
 auditor, the master public key of the exchange, and the number of signed
 denomination keys:
 
-::
+.. code-block:: c
 
    struct AuditorFileHeaderP {
      struct TALER_AuditorPublicKeyP apub;