diff --git a/psycopg/adapter_asis.c b/psycopg/adapter_asis.c
index 93a793c3..8b20a203 100644
--- a/psycopg/adapter_asis.c
+++ b/psycopg/adapter_asis.c
@@ -52,7 +52,7 @@ asis_getquoted(asisObject *self, PyObject *args)
 }
 
 PyObject *
-asis_conform(binaryObject *self, PyObject *args)
+asis_conform(asisObject *self, PyObject *args)
 {
     PyObject *res, *proto;
     
diff --git a/psycopg/adapter_datetime.c b/psycopg/adapter_datetime.c
index acbf43b1..9d40cc59 100644
--- a/psycopg/adapter_datetime.c
+++ b/psycopg/adapter_datetime.c
@@ -84,7 +84,7 @@ pydatetime_getquoted(pydatetimeObject *self, PyObject *args)
 }
 
 PyObject *
-datetime_conform(binaryObject *self, PyObject *args)
+pydatetime_conform(pydatetimeObject *self, PyObject *args)
 {
     PyObject *res, *proto;
     
diff --git a/psycopg/adapter_mxdatetime.c b/psycopg/adapter_mxdatetime.c
index 3a1b5966..3c9dc760 100644
--- a/psycopg/adapter_mxdatetime.c
+++ b/psycopg/adapter_mxdatetime.c
@@ -60,7 +60,7 @@ mxdatetime_getquoted(mxdatetimeObject *self, PyObject *args)
 }
 
 PyObject *
-mxdatetime_conform(binaryObject *self, PyObject *args)
+mxdatetime_conform(mxdatetimeObject *self, PyObject *args)
 {
     PyObject *res, *proto;
     
diff --git a/psycopg/adapter_pboolean.c b/psycopg/adapter_pboolean.c
index cb77fc81..80e18eb7 100644
--- a/psycopg/adapter_pboolean.c
+++ b/psycopg/adapter_pboolean.c
@@ -53,7 +53,7 @@ pboolean_getquoted(pbooleanObject *self, PyObject *args)
 }
 
 PyObject *
-pboolean_conform(binaryObject *self, PyObject *args)
+pboolean_conform(pbooleanObject *self, PyObject *args)
 {
     PyObject *res, *proto;
     
diff --git a/psycopg/adapter_qstring.c b/psycopg/adapter_qstring.c
index 93d3dade..67d2708c 100644
--- a/psycopg/adapter_qstring.c
+++ b/psycopg/adapter_qstring.c
@@ -185,7 +185,7 @@ qstring_prepare(qstringObject *self, PyObject *args)
 }
     
 PyObject *
-qstring_conform(binaryObject *self, PyObject *args)
+qstring_conform(qstringObject *self, PyObject *args)
 {
     PyObject *res, *proto;