diff --git a/apache2/apache2_io.c b/apache2/apache2_io.c
index ffc1cef4..26f6b864 100644
--- a/apache2/apache2_io.c
+++ b/apache2/apache2_io.c
@@ -505,7 +505,7 @@ static void inject_content_to_of_brigade(modsec_rec *msr, ap_filter_t *f) {
         APR_BRIGADE_INSERT_HEAD(msr->of_brigade, bucket_ci);
 
         if (msr->txcfg->debuglog_level >= 9) {
-            msr_log(msr, 9, "Content Injection: Data reinjected bytes [%d]",msr->stream_output_length);
+            msr_log(msr, 9, "Content Injection: Data reinjected bytes [%"APR_SIZE_T_FMT"]",msr->stream_output_length);
         }
 
     }
diff --git a/apache2/mod_security2.c b/apache2/mod_security2.c
index b41f6c5b..5ee72b04 100644
--- a/apache2/mod_security2.c
+++ b/apache2/mod_security2.c
@@ -859,7 +859,7 @@ static int hook_request_late(request_rec *r) {
 
     if(msr->txcfg->stream_inbody_inspection && msr->msc_reqbody_read)    {
         const char *clen = NULL;
-        clen = apr_psprintf(msr->mp,"%d",msr->stream_input_length);
+        clen = apr_psprintf(msr->mp,"%"APR_SIZE_T_FMT,msr->stream_input_length);
         if(clen)
             apr_table_setn(r->headers_in, "Content-Length",clen);
     }
diff --git a/apache2/msc_reqbody.c b/apache2/msc_reqbody.c
index 4879b394..88739c21 100644
--- a/apache2/msc_reqbody.c
+++ b/apache2/msc_reqbody.c
@@ -411,7 +411,7 @@ static apr_status_t modsecurity_request_body_to_stream(modsec_rec *msr, char **e
     }
 
     if (msr->stream_input_data== NULL) {
-        *error_msg = apr_psprintf(msr->mp, "Unable to allocate memory to hold request body on stream. Asked for %u bytes.",
+        *error_msg = apr_psprintf(msr->mp, "Unable to allocate memory to hold request body on stream. Asked for %" APR_SIZE_T_FMT " bytes.",
             msr->stream_input_length + 1);
         return -1;
     }