diff --git a/src/backends/oracle/blob.cpp b/src/backends/oracle/blob.cpp
index ba77d87cb..d7852f0c4 100644
--- a/src/backends/oracle/blob.cpp
+++ b/src/backends/oracle/blob.cpp
@@ -5,6 +5,7 @@
 // http://www.boost.org/LICENSE_1_0.txt)
 //
 
+#define SOCI_ORACLE_SOURCE
 #include "soci/oracle/soci-oracle.h"
 #include "error.h"
 #include "soci/statement.h"
diff --git a/src/backends/oracle/standard-use-type.cpp b/src/backends/oracle/standard-use-type.cpp
index 017a46dbe..c9adf4422 100644
--- a/src/backends/oracle/standard-use-type.cpp
+++ b/src/backends/oracle/standard-use-type.cpp
@@ -5,7 +5,7 @@
 // http://www.boost.org/LICENSE_1_0.txt)
 //
 
-#define soci_ORACLE_SOURCE
+#define SOCI_ORACLE_SOURCE
 #include "soci/oracle/soci-oracle.h"
 #include "soci/blob.h"
 #include "clob.h"
diff --git a/src/backends/oracle/statement.cpp b/src/backends/oracle/statement.cpp
index 0622db91c..ec4702f24 100644
--- a/src/backends/oracle/statement.cpp
+++ b/src/backends/oracle/statement.cpp
@@ -5,8 +5,7 @@
 // http://www.boost.org/LICENSE_1_0.txt)
 //
 
-#define soci_ORACLE_SOURCE
-
+#define SOCI_ORACLE_SOURCE
 #include "soci/oracle/soci-oracle.h"
 #include "error.h"
 #include "soci/soci-backend.h"
diff --git a/src/backends/oracle/vector-into-type.cpp b/src/backends/oracle/vector-into-type.cpp
index d838b6849..6ec30181b 100644
--- a/src/backends/oracle/vector-into-type.cpp
+++ b/src/backends/oracle/vector-into-type.cpp
@@ -5,7 +5,7 @@
 // http://www.boost.org/LICENSE_1_0.txt)
 //
 
-#define soci_ORACLE_SOURCE
+#define SOCI_ORACLE_SOURCE
 #include "soci/oracle/soci-oracle.h"
 #include "soci/statement.h"
 #include "clob.h"
diff --git a/src/backends/oracle/vector-use-type.cpp b/src/backends/oracle/vector-use-type.cpp
index dc182382f..e6aef3336 100644
--- a/src/backends/oracle/vector-use-type.cpp
+++ b/src/backends/oracle/vector-use-type.cpp
@@ -5,7 +5,7 @@
 // http://www.boost.org/LICENSE_1_0.txt)
 //
 
-#define soci_ORACLE_SOURCE
+#define SOCI_ORACLE_SOURCE
 #include "soci/oracle/soci-oracle.h"
 #include "clob.h"
 #include "error.h"