diff --git a/pjlib/src/pjlib-test/string.c b/pjlib/src/pjlib-test/string.c
index ad1951921..09757fa01 100644
--- a/pjlib/src/pjlib-test/string.c
+++ b/pjlib/src/pjlib-test/string.c
@@ -296,11 +296,11 @@ static int verify_strxcpy(const char *src, int dst_size, int exp_ret,
 {
     char dst[6];
     const char GUARDS[2] = {'@', '\0'};
-    int i, ret;
+    int i, ig, ret;
 
     PJ_ASSERT_RETURN(src && dst_size <= 5, -700);
 
-    for (int ig=0; ig<sizeof(GUARDS); ++ig) {
+    for (ig=0; ig<(int)sizeof(GUARDS); ++ig) {
         char GUARD = GUARDS[ig];
 
         memset(dst, GUARD, sizeof(dst));
@@ -400,11 +400,11 @@ static int verify_strxcpy2(const pj_str_t *src, int dst_size, int exp_ret,
 {
     char dst[6];
     const char GUARDS[2] = {'@', '\0'};
-    int i, ret;
+    int i, ret, ig;
 
     PJ_ASSERT_RETURN(src && dst_size <= 5, -720);
 
-    for (int ig=0; ig<sizeof(GUARDS); ++ig) {
+    for (ig=0; ig<(int)sizeof(GUARDS); ++ig) {
         char GUARD = GUARDS[ig];
 
         memset(dst, GUARD, sizeof(dst));
@@ -432,7 +432,7 @@ static int verify_strxcpy2(const pj_str_t *src, int dst_size, int exp_ret,
         }
 
         /* verify not writing pass buffer */
-        for (i=dst_size; i<sizeof(dst); ++i) {
+        for (i=dst_size; i<(int)sizeof(dst); ++i) {
             if (dst[i] != GUARD) {
                 PJ_LOG(3,("", "  strxcpy2 \"%.*s\" slen=%ld, dst_size=%d: "
                             "overflow at %d (chr %d)",
@@ -526,19 +526,19 @@ static int verify_strxcat(const char *cdst, const char *src, int dst_size,
 {
     char dst[6];
     const char GUARDS[2] = {'@', '\0'};
-    int i, ret;
+    int i, ret, ig;
 
     PJ_ASSERT_RETURN(src && strlen(cdst) <= 4, -730);
     PJ_ASSERT_RETURN((int)strlen(cdst) < dst_size ||
                      (strlen(cdst)==0 && dst_size==0), -731);
 
-    for (int ig=0; ig<sizeof(GUARDS); ++ig) {
+    for (ig=0; ig<(int)sizeof(GUARDS); ++ig) {
         char GUARD = GUARDS[ig];
         
         memset(dst, GUARD, sizeof(dst));
         if (dst_size) {
             ret = pj_ansi_strxcpy(dst, cdst, dst_size);
-            PJ_ASSERT_RETURN(ret==strlen(cdst), -732);
+            PJ_ASSERT_RETURN(ret==(int)strlen(cdst), -732);
         }
 
         ret = pj_ansi_strxcat(dst, src, dst_size);
diff --git a/pjmedia/src/pjmedia-audiodev/alsa_dev.c b/pjmedia/src/pjmedia-audiodev/alsa_dev.c
index 908fac04c..37346f898 100755
--- a/pjmedia/src/pjmedia-audiodev/alsa_dev.c
+++ b/pjmedia/src/pjmedia-audiodev/alsa_dev.c
@@ -193,7 +193,7 @@ static void alsa_error_handler (const char *file,
     }
 
     va_start (arg, fmt);
-    if (index < sizeof(err_msg)-1) {
+    if (index < (int)sizeof(err_msg)-1) {
         len = vsnprintf( err_msg+index, sizeof(err_msg)-index, fmt, arg);
         if (len < 1 || len >= (int)sizeof(err_msg)-index)
             len = sizeof(err_msg)-index-1;
@@ -201,7 +201,7 @@ static void alsa_error_handler (const char *file,
         err_msg[index] = '\0';
     }
     va_end(arg);
-    if (err && index < sizeof(err_msg)-1) {
+    if (err && index < (int)sizeof(err_msg)-1) {
         len = snprintf( err_msg+index, sizeof(err_msg)-index, ": %s",
                         snd_strerror(err));
         if (len < 1 || len >= (int)sizeof(err_msg)-index)
@@ -635,7 +635,7 @@ static pj_status_t open_playback (struct alsa_stream* stream,
     snd_pcm_uframes_t tmp_buf_size;
     snd_pcm_uframes_t tmp_period_size;
 
-    if (param->play_id < 0 || param->play_id >= stream->af->dev_cnt)
+    if (param->play_id < 0 || param->play_id >= (int)stream->af->dev_cnt)
         return PJMEDIA_EAUD_INVDEV;
 
     /* Open PCM for playback */
@@ -773,7 +773,7 @@ static pj_status_t open_capture (struct alsa_stream* stream,
     snd_pcm_uframes_t tmp_buf_size;
     snd_pcm_uframes_t tmp_period_size;
 
-    if (param->rec_id < 0 || param->rec_id >= stream->af->dev_cnt)
+    if (param->rec_id < 0 || param->rec_id >= (int)stream->af->dev_cnt)
         return PJMEDIA_EAUD_INVDEV;
 
     /* Open PCM for capture */
diff --git a/pjmedia/src/pjmedia-codec/silk.c b/pjmedia/src/pjmedia-codec/silk.c
index 66050704e..11c07eb19 100644
--- a/pjmedia/src/pjmedia-codec/silk.c
+++ b/pjmedia/src/pjmedia-codec/silk.c
@@ -472,7 +472,8 @@ static pj_status_t silk_enum_codecs(pjmedia_codec_factory *factory,
     max = *count;
     *count = 0;
 
-    for (i = 0; i<PJ_ARRAY_SIZE(silk_factory.silk_param) && *count<max; ++i)
+    for (i = 0; i<(int)PJ_ARRAY_SIZE(silk_factory.silk_param) && *count<max;
+         ++i)
     {
         silk_param *sp = &silk_factory.silk_param[i];
 
diff --git a/pjmedia/src/pjmedia-videodev/v4l2_dev.c b/pjmedia/src/pjmedia-videodev/v4l2_dev.c
index 26b988946..881e6c220 100644
--- a/pjmedia/src/pjmedia-videodev/v4l2_dev.c
+++ b/pjmedia/src/pjmedia-videodev/v4l2_dev.c
@@ -244,7 +244,7 @@ static void v4l2_get_supported_size(int fd,
     if (fmt_map == NULL)
         return;
 
-    for (;i<PJ_ARRAY_SIZE(v4l_sizes) &&
+    for (;i<(int)PJ_ARRAY_SIZE(v4l_sizes) &&
           info->fmt_cnt<PJMEDIA_VID_DEV_INFO_FMT_CNT;
          i++)
     {
@@ -322,7 +322,7 @@ static pj_status_t v4l2_scan_devs(vid4lin_factory *f)
 
         PJ_LOG(5,(THIS_FILE, "Found capture device %s", pdi->v4l2_cap.card));
         PJ_LOG(5,(THIS_FILE, "  Enumerating formats:"));
-        for (j=0; fmt_cnt<PJ_ARRAY_SIZE(fmt_cap); ++j) {
+        for (j=0; fmt_cnt<(int)PJ_ARRAY_SIZE(fmt_cap); ++j) {
             struct v4l2_fmtdesc fdesc;
             unsigned k;
 
@@ -597,7 +597,7 @@ static pj_status_t vid4lin_factory_create_stream(pjmedia_vid_dev_factory *f,
                      param->fmt.detail_type == PJMEDIA_FORMAT_DETAIL_VIDEO &&
                      param->dir == PJMEDIA_DIR_CAPTURE,
                      PJ_EINVAL);
-    PJ_ASSERT_RETURN(param->cap_id >= 0 && param->cap_id < cf->dev_count,
+    PJ_ASSERT_RETURN(param->cap_id >= 0 && param->cap_id < (int)cf->dev_count,
                      PJMEDIA_EVID_INVDEV);
 
     fmt_info = pjmedia_get_video_format_info(NULL, param->fmt.id);
diff --git a/pjmedia/src/pjmedia/transport_srtp_dtls.c b/pjmedia/src/pjmedia/transport_srtp_dtls.c
index ee44c154e..54e5d4f93 100644
--- a/pjmedia/src/pjmedia/transport_srtp_dtls.c
+++ b/pjmedia/src/pjmedia/transport_srtp_dtls.c
@@ -578,7 +578,7 @@ static pj_status_t ssl_get_srtp_material(dtls_srtp *ds)
     rx = &ds->rx_crypto;
     pj_bzero(tx, sizeof(*tx));
     pj_bzero(rx, sizeof(*rx));
-    for (i=0; i<PJ_ARRAY_SIZE(ossl_profiles); ++i) {
+    for (i=0; i<(int)PJ_ARRAY_SIZE(ossl_profiles); ++i) {
         if (pj_ansi_stricmp(profile->name, ossl_profiles[i])==0) {
             pj_strset2(&tx->name, pj_profiles[i]);
             pj_strset2(&rx->name, pj_profiles[i]);
diff --git a/third_party/g7221/common/basic_op.c b/third_party/g7221/common/basic_op.c
index 028d06fe9..6aa7a0df3 100644
--- a/third_party/g7221/common/basic_op.c
+++ b/third_party/g7221/common/basic_op.c
@@ -1529,7 +1529,7 @@ LIBG7221_DEF(Word16) i_mult (Word16 a, Word16 b)
 #ifdef ORIGINAL_G7231
    return a*b ;
 #else
-   Word32 register c=a*b;
+   register Word32 c=a*b;
 #if (WMOPS)
     multiCounter[currCounter].i_mult++;
 #endif