diff --git a/apache2/apache2_config.c b/apache2/apache2_config.c
index e38cf4e9..3ab618a9 100644
--- a/apache2/apache2_config.c
+++ b/apache2/apache2_config.c
@@ -73,7 +73,9 @@ void *create_directory_config(apr_pool_t *mp, char *path)
     /* audit log variables */
     dcfg->auditlog_flag = NOT_SET;
     dcfg->auditlog_type = NOT_SET;
+    #ifdef WITH_YAJL
     dcfg->auditlog_format = NOT_SET;
+    #endif
     dcfg->max_rule_time = NOT_SET;
     dcfg->auditlog_dirperms = NOT_SET;
     dcfg->auditlog_fileperms = NOT_SET;
@@ -504,8 +506,10 @@ void *merge_directory_configs(apr_pool_t *mp, void *_parent, void *_child)
         merged->auditlog2_fd = parent->auditlog2_fd;
         merged->auditlog2_name = parent->auditlog2_name;
     }
+    #ifdef WITH_YAJL
     merged->auditlog_format = (child->auditlog_format == NOT_SET
         ? parent->auditlog_format : child->auditlog_format);
+    #endif
     merged->auditlog_storage_dir = (child->auditlog_storage_dir == NOT_SET_P
         ? parent->auditlog_storage_dir : child->auditlog_storage_dir);
     merged->auditlog_parts = (child->auditlog_parts == NOT_SET_P
@@ -670,7 +674,9 @@ void init_directory_config(directory_config *dcfg)
     /* audit log variables */
     if (dcfg->auditlog_flag == NOT_SET) dcfg->auditlog_flag = 0;
     if (dcfg->auditlog_type == NOT_SET) dcfg->auditlog_type = AUDITLOG_SERIAL;
+    #ifdef WITH_YAJL
     if (dcfg->auditlog_format == NOT_SET) dcfg->auditlog_format = AUDITLOGFORMAT_NATIVE;
+    #endif
     if (dcfg->max_rule_time == NOT_SET) dcfg->max_rule_time = 0;
     if (dcfg->auditlog_dirperms == NOT_SET) dcfg->auditlog_dirperms = CREATEMODE_DIR;
     if (dcfg->auditlog_fileperms == NOT_SET) dcfg->auditlog_fileperms = CREATEMODE;
@@ -1295,6 +1301,7 @@ static const char *cmd_audit_log_type(cmd_parms *cmd, void *_dcfg,
     return NULL;
 }
 
+#ifdef WITH_YAJL
 static const char *cmd_audit_log_mode(cmd_parms *cmd, void *_dcfg,
         const char *p1)
 {
@@ -1309,6 +1316,7 @@ static const char *cmd_audit_log_mode(cmd_parms *cmd, void *_dcfg,
 
     return NULL;
 }
+#endif
 
 static const char *cmd_audit_log_dirmode(cmd_parms *cmd, void *_dcfg,
         const char *p1)
@@ -3251,6 +3259,7 @@ const command_rec module_directives[] = {
         "whether to use the old audit log format (Serial) or new (Concurrent)"
     ),
 
+#ifdef WITH_YAJL
     AP_INIT_TAKE1 (
         "SecAuditLogFormat",
         cmd_audit_log_mode,
@@ -3258,6 +3267,7 @@ const command_rec module_directives[] = {
         CMD_SCOPE_ANY,
         "whether to emit audit log data in native format or JSON"
     ),
+#endif
 
     AP_INIT_TAKE1 (
         "SecAuditLogStorageDir",
diff --git a/apache2/modsecurity.h b/apache2/modsecurity.h
index bc015f93..228bea0b 100644
--- a/apache2/modsecurity.h
+++ b/apache2/modsecurity.h
@@ -519,8 +519,10 @@ struct directory_config {
     /* AUDITLOG_SERIAL (single file) or AUDITLOG_CONCURRENT (multiple files) */
     int                  auditlog_type;
 
+#ifdef WITH_YAJL
     /* AUDITLOGFORMAT_NATIVE or AUDITLOGFORMAT_JSON */
     int                  auditlog_format;
+#endif
 
     /* Mode for audit log directories and files */
     apr_fileperms_t      auditlog_dirperms;
diff --git a/apache2/msc_logging.c b/apache2/msc_logging.c
index 771b52b5..6a03d818 100644
--- a/apache2/msc_logging.c
+++ b/apache2/msc_logging.c
@@ -25,8 +25,10 @@
 #include "apr_version.h"
 #include <libxml/xmlversion.h>
 
+#ifdef WITH_YAJL
 #include <yajl/yajl_gen.h>
 #include "msc_logging_json.h"
+#endif
 
 /**
  * Write the supplied data to the audit log (if the FD is ready), update
@@ -384,6 +386,7 @@ static void sec_auditlog_write_producer_header(modsec_rec *msr) {
     sec_auditlog_write(msr, ".\n", 2);
 }
 
+#ifdef WITH_YAJL
 /**
  * Ouput the Producer header into a JSON generator
  */
@@ -415,6 +418,7 @@ static void sec_auditlog_write_producer_header_json(modsec_rec *msr, yajl_gen g)
 
     yajl_gen_array_close(g); // array for producers is finished
 }
+#endif
 
 /*
 * \brief This function will returns the next chain node
@@ -515,6 +519,7 @@ static int chained_is_matched(modsec_rec *msr, const msre_rule *next_rule) {
     return 0;
 }
 
+#ifdef WITH_YAJL
 /**
  * Write detailed information about performance metrics into a JSON generator
  */
@@ -1516,6 +1521,7 @@ void sec_audit_logger_json(modsec_rec *msr) {
         apr_file_write_full(msr->txcfg->auditlog2_fd, text, nbytes, &nbytes_written);
     }
 }
+#endif
 
 /*
  * Produce an audit log entry in native format.
@@ -2282,9 +2288,13 @@ void sec_audit_logger_native(modsec_rec *msr) {
  * Handler for audit log writers.
  */
 void sec_audit_logger(modsec_rec *msr) {
+    #ifdef WITH_YAJL
     if (msr->txcfg->auditlog_format == AUDITLOGFORMAT_JSON) {
         sec_audit_logger_json(msr);
     } else {
+    #endif
         sec_audit_logger_native(msr);
+    #ifdef WITH_YAJL
     }
+    #endif
 }
diff --git a/apache2/msc_logging.h b/apache2/msc_logging.h
index 9b1b4885..5378ddc6 100644
--- a/apache2/msc_logging.h
+++ b/apache2/msc_logging.h
@@ -22,8 +22,10 @@
 #define AUDITLOG_SERIAL                      0
 #define AUDITLOG_CONCURRENT                  1
 
+#ifdef WITH_YAJL
 #define AUDITLOGFORMAT_JSON                  0
 #define AUDITLOGFORMAT_NATIVE                1
+#endif
 
 #define AUDITLOG_PART_FIRST                 'A'
 #define AUDITLOG_PART_HEADER                'A'