diff --git a/include/maxscale/cdefs.h b/include/maxscale/cdefs.h
index 3ca29133d..21263b5dc 100644
--- a/include/maxscale/cdefs.h
+++ b/include/maxscale/cdefs.h
@@ -39,6 +39,14 @@
 #undef OPENSSL_THREAD_DEFINES
 #define OPENSSL_THREAD_DEFINES 1
 
+/**
+ * Fix compile errors for PRId64
+ * in Centos 6
+ */
+#ifndef __STDC_FORMAT_MACROS
+# define __STDC_FORMAT_MACROS
+#endif
+
 /**
  * Define intended for use with strerror.
  *
diff --git a/server/core/config.cc b/server/core/config.cc
index 1e1789f5b..0048f6535 100644
--- a/server/core/config.cc
+++ b/server/core/config.cc
@@ -623,7 +623,8 @@ config_load_and_process(const char* filename, bool (*process_config)(CONFIG_CONT
 
     if (duplicate_context_init(&dcontext))
     {
-        CONFIG_CONTEXT ccontext = {.object = (char*)""};
+        CONFIG_CONTEXT ccontext = {};
+        ccontext.object = (char*)"";
 
         if (config_load_single_file(filename, &dcontext, &ccontext))
         {
diff --git a/server/core/config_runtime.cc b/server/core/config_runtime.cc
index 610647d54..22bd913d3 100644
--- a/server/core/config_runtime.cc
+++ b/server/core/config_runtime.cc
@@ -348,7 +348,8 @@ static void add_monitor_defaults(MXS_MONITOR *monitor)
 {
     /** Inject the default module parameters in case we only deleted
      * a parameter */
-    CONFIG_CONTEXT ctx = {.object = (char*)""};
+    CONFIG_CONTEXT ctx = {};
+    ctx.object = (char*)"";
     const MXS_MODULE *mod = get_module(monitor->module_name, MODULE_MONITOR);
 
     if (mod)
@@ -427,7 +428,9 @@ bool runtime_alter_monitor(MXS_MONITOR *monitor, char *key, char *value)
 
             if (value[0])
             {
-                MXS_CONFIG_PARAMETER p = {.name = key, .value = value};
+                MXS_CONFIG_PARAMETER p = {};
+                p.name = key;
+                p.value = value;
                 monitorAddParameters(monitor, &p);
             }
 
diff --git a/server/core/dcb.cc b/server/core/dcb.cc
index 715018e24..a731922db 100644
--- a/server/core/dcb.cc
+++ b/server/core/dcb.cc
@@ -2461,7 +2461,9 @@ bool count_by_usage_cb(DCB *dcb, void *data)
 int
 dcb_count_by_usage(DCB_USAGE usage)
 {
-    struct dcb_usage_count val = {.count = 0, .type = usage};
+    struct dcb_usage_count val = {};
+    val.count = 0;
+    val.type = usage;
 
     dcb_foreach(count_by_usage_cb, &val);
 
diff --git a/server/core/filter.cc b/server/core/filter.cc
index d67af9e4c..853b26168 100644
--- a/server/core/filter.cc
+++ b/server/core/filter.cc
@@ -329,7 +329,8 @@ filter_add_option(MXS_FILTER_DEF *filter, const char *option)
 void
 filter_add_parameter(MXS_FILTER_DEF *filter, const char *name, const char *value)
 {
-    CONFIG_CONTEXT ctx = {.object = (char*)""};
+    CONFIG_CONTEXT ctx = {};
+    ctx.object = (char*)"";
 
     config_add_param(&ctx, name, value);
     ctx.parameters->next = filter->parameters;