diff --git a/src/ngx_postgres_escape.c b/src/ngx_postgres_escape.c
index 5adf9304..3b589741 100644
--- a/src/ngx_postgres_escape.c
+++ b/src/ngx_postgres_escape.c
@@ -24,7 +24,10 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#ifndef DDEBUG
 #define DDEBUG 0
+#endif
+
 #include "ngx_postgres_ddebug.h"
 #include "ngx_postgres_escape.h"
 #include "ngx_postgres_module.h"
diff --git a/src/ngx_postgres_handler.c b/src/ngx_postgres_handler.c
index 8f51e2de..5f2c3b72 100644
--- a/src/ngx_postgres_handler.c
+++ b/src/ngx_postgres_handler.c
@@ -26,7 +26,10 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#ifndef DDEBUG
 #define DDEBUG 0
+#endif
+
 #include "ngx_postgres_ddebug.h"
 #include "ngx_postgres_handler.h"
 #include "ngx_postgres_module.h"
diff --git a/src/ngx_postgres_keepalive.c b/src/ngx_postgres_keepalive.c
index e0f6880d..82574a53 100644
--- a/src/ngx_postgres_keepalive.c
+++ b/src/ngx_postgres_keepalive.c
@@ -25,7 +25,10 @@
  * SUCH DAMAGE.
  */
 
+#ifndef DDEBUG
 #define DDEBUG 0
+#endif
+
 #include "ngx_postgres_ddebug.h"
 #include "ngx_postgres_keepalive.h"
 
diff --git a/src/ngx_postgres_module.c b/src/ngx_postgres_module.c
index 318c5f5d..fed41647 100644
--- a/src/ngx_postgres_module.c
+++ b/src/ngx_postgres_module.c
@@ -26,7 +26,10 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#ifndef DDEBUG
 #define DDEBUG 0
+#endif
+
 #include "ngx_postgres_ddebug.h"
 #include "ngx_postgres_escape.h"
 #include "ngx_postgres_handler.h"
diff --git a/src/ngx_postgres_output.c b/src/ngx_postgres_output.c
index 015c70da..9fd96bc0 100644
--- a/src/ngx_postgres_output.c
+++ b/src/ngx_postgres_output.c
@@ -26,7 +26,10 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#ifndef DDEBUG
 #define DDEBUG 0
+#endif
+
 #include "ngx_postgres_ddebug.h"
 #include "ngx_postgres_module.h"
 #include "ngx_postgres_output.h"
diff --git a/src/ngx_postgres_processor.c b/src/ngx_postgres_processor.c
index d007024e..2e8f0ef1 100644
--- a/src/ngx_postgres_processor.c
+++ b/src/ngx_postgres_processor.c
@@ -26,7 +26,10 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#ifndef DDEBUG
 #define DDEBUG 0
+#endif
+
 #include "ngx_postgres_ddebug.h"
 #include "ngx_postgres_output.h"
 #include "ngx_postgres_processor.h"
diff --git a/src/ngx_postgres_rewrite.c b/src/ngx_postgres_rewrite.c
index 1e316dd3..beaef097 100644
--- a/src/ngx_postgres_rewrite.c
+++ b/src/ngx_postgres_rewrite.c
@@ -24,7 +24,10 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#ifndef DDEBUG
 #define DDEBUG 0
+#endif
+
 #include "ngx_postgres_ddebug.h"
 #include "ngx_postgres_module.h"
 #include "ngx_postgres_rewrite.h"
diff --git a/src/ngx_postgres_upstream.c b/src/ngx_postgres_upstream.c
index 9732139c..c8f17492 100644
--- a/src/ngx_postgres_upstream.c
+++ b/src/ngx_postgres_upstream.c
@@ -26,7 +26,10 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#ifndef DDEBUG
 #define DDEBUG 0
+#endif
+
 #include "ngx_postgres_ddebug.h"
 #include "ngx_postgres_module.h"
 #include "ngx_postgres_keepalive.h"
diff --git a/src/ngx_postgres_util.c b/src/ngx_postgres_util.c
index 61a44ad1..f2894c1a 100644
--- a/src/ngx_postgres_util.c
+++ b/src/ngx_postgres_util.c
@@ -25,7 +25,9 @@
  * SUCH DAMAGE.
  */
 
+#ifndef DDEBUG
 #define DDEBUG 0
+#endif
 
 #include <nginx.h>
 
diff --git a/src/ngx_postgres_variable.c b/src/ngx_postgres_variable.c
index 67ee2928..e7f4f381 100644
--- a/src/ngx_postgres_variable.c
+++ b/src/ngx_postgres_variable.c
@@ -24,7 +24,10 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#ifndef DDEBUG
 #define DDEBUG 0
+#endif
+
 #include "ngx_postgres_ddebug.h"
 #include "ngx_postgres_module.h"
 #include "ngx_postgres_variable.h"