diff --git a/content/fs_backing_store.c b/content/fs_backing_store.c
index fa9fffeea..aff1534ff 100644
--- a/content/fs_backing_store.c
+++ b/content/fs_backing_store.c
@@ -1614,7 +1614,7 @@ static nserror store_write_block(struct store_state *state,
 			offst);
 	if (wr != (ssize_t)bse->elem[elem_idx].size) {
 		NSLOG(netsurf, ERROR,
-		      "Write failed %"PRIssizet" of %"PRId32" bytes from %p at %"PRIsizet" block %d errno %d",
+		      "Write failed %"PRIssizet" of %"PRId32" bytes from %p at %"PRIsizet" block %"PRIu16" errno %d",
 		      wr,
 		      bse->elem[elem_idx].size,
 		      bse->elem[elem_idx].data,
@@ -1784,7 +1784,7 @@ static nserror store_read_block(struct store_state *state,
 		       offst);
 	if (rd != (ssize_t)bse->elem[elem_idx].size) {
 		NSLOG(netsurf, ERROR,
-		      "Failed reading %"PRIssizet" of %"PRId32" bytes into %p from %"PRIsizet" block %d errno %d",
+		      "Failed reading %"PRIssizet" of %"PRId32" bytes into %p from %"PRIsizet" block %"PRIu16" errno %d",
 		      rd,
 		      bse->elem[elem_idx].size,
 		      bse->elem[elem_idx].data,
diff --git a/content/handlers/css/dump.c b/content/handlers/css/dump.c
index 799ee5e54..950a6f8cc 100644
--- a/content/handlers/css/dump.c
+++ b/content/handlers/css/dump.c
@@ -38,7 +38,7 @@ static void dump_css_fixed(FILE *stream, css_fixed f)
 	uint32_t fracpart = ((NSCSS_ABS(f) & 0x3ff) * 1000 + 500) / (1 << 10);
 #undef NSCSS_ABS
 
-	fprintf(stream, "%s%"PRId32".%03ld", f < 0 ? "-" : "", uintpart, fracpart);
+	fprintf(stream, "%s%"PRIu32".%03"PRIu32, f < 0 ? "-" : "", uintpart, fracpart);
 }
 
 /**
@@ -50,7 +50,7 @@ static void dump_css_fixed(FILE *stream, css_fixed f)
 static void dump_css_number(FILE *stream, css_fixed val)
 {
 	if (INTTOFIX(FIXTOINT(val)) == val)
-		fprintf(stream, "%"PRId32"", FIXTOINT(val));
+		fprintf(stream, "%"PRId32, FIXTOINT(val));
 	else
 		dump_css_fixed(stream, val);
 }
diff --git a/content/handlers/html/form.c b/content/handlers/html/form.c
index b1e911cb8..afa40ac2e 100644
--- a/content/handlers/html/form.c
+++ b/content/handlers/html/form.c
@@ -487,7 +487,7 @@ form_dom_to_data_select(dom_html_select_element *select_element,
 						       &option_element);
 		if (exp != DOM_NO_ERR) {
 			NSLOG(netsurf, INFO,
-			      "Could not get options item %"PRId32"", option_index);
+			      "Could not get options item %"PRId32, option_index);
 			res = NSERROR_DOM;
 		} else {
 			res = form_dom_to_data_select_option(
@@ -1101,7 +1101,7 @@ form_dom_to_data(struct form *form,
 		exp = dom_html_collection_item(elements, element_idx, &element);
 		if (exp != DOM_NO_ERR) {
 			NSLOG(netsurf, INFO,
-			      "retrieving form element %"PRId32" failed with %d",
+			      "retrieving form element %"PRIu32" failed with %d",
 			      element_idx, exp);
 			res = NSERROR_DOM;
 			goto form_dom_to_data_error;
@@ -1111,7 +1111,7 @@ form_dom_to_data(struct form *form,
 		exp = dom_node_get_node_name(element, &nodename);
 		if (exp != DOM_NO_ERR) {
 			NSLOG(netsurf, INFO,
-			      "getting element node name %"PRId32" failed with %d",
+			      "getting element node name %"PRIu32" failed with %d",
 			      element_idx, exp);
 			dom_node_unref(element);
 			res = NSERROR_DOM;
diff --git a/content/hlcache.c b/content/hlcache.c
index 59ed17e4d..5cba88bc6 100644
--- a/content/hlcache.c
+++ b/content/hlcache.c
@@ -593,7 +593,7 @@ void hlcache_finalise(void)
 		num_contents++;
 	}
 
-	NSLOG(netsurf, INFO, "%"PRId32" contents remain before cache drain",
+	NSLOG(netsurf, INFO, "%"PRIu32" contents remain before cache drain",
 	      num_contents);
 
 	/* Drain cache */
@@ -608,7 +608,8 @@ void hlcache_finalise(void)
 		}
 	} while (num_contents > 0 && num_contents != prev_contents);
 
-	NSLOG(netsurf, INFO, "%"PRId32" contents remaining after being polite", num_contents);
+	NSLOG(netsurf, INFO, "%"PRIu32" contents remaining after being polite",
+			num_contents);
 
 	/* Drain cache again, forcing the matter */
 	do {
@@ -622,12 +623,12 @@ void hlcache_finalise(void)
 		}
 	} while (num_contents > 0 && num_contents != prev_contents);
 
-	NSLOG(netsurf, INFO, "%"PRId32" contents remaining:", num_contents);
+	NSLOG(netsurf, INFO, "%"PRIu32" contents remaining:", num_contents);
 	for (entry = hlcache->content_list; entry != NULL; entry = entry->next) {
 		hlcache_handle entry_handle = { entry, NULL, NULL };
 
 		if (entry->content != NULL) {
-			NSLOG(netsurf, INFO, "	%p : %s (%"PRId32" users)",
+			NSLOG(netsurf, INFO, "	%p : %s (%"PRIu32" users)",
 			      entry,
 			      nsurl_access(hlcache_handle_get_url(&entry_handle)),
 			      content_count_users(entry->content));
diff --git a/content/llcache.c b/content/llcache.c
index 9d69c9651..175c5c81e 100644
--- a/content/llcache.c
+++ b/content/llcache.c
@@ -3897,7 +3897,7 @@ llcache_initialise(const struct llcache_parameters *prm)
 	llcache->all_caught_up = true;
 
 	NSLOG(llcache, INFO,
-	      "llcache initialising with a limit of %"PRId32" bytes",
+	      "llcache initialising with a limit of %"PRIu32" bytes",
 	      llcache->limit);
 
 	/* backing store initialisation */
diff --git a/utils/nsoption.c b/utils/nsoption.c
index cd7791d75..7306dee1b 100644
--- a/utils/nsoption.c
+++ b/utils/nsoption.c
@@ -391,7 +391,7 @@ nsoption_output_value_html(struct nsoption_s *option,
 					"#%06"PRIX32
 				"</span> "
 				"<span style=\"background-color: #%06"PRIx32"; "
-					"border: 1px solid #%06x; "
+					"border: 1px solid #%06"PRIx32"; "
 					"display: inline-block; "
 					"width: 1em; height: 1em;\">"
 				"</span>",
@@ -460,7 +460,7 @@ nsoption_output_value_text(struct nsoption_s *option,
 		rgbcolour = (((0x000000FF & option->value.c) << 16) |
 			     ((0x0000FF00 & option->value.c) << 0) |
 			     ((0x00FF0000 & option->value.c) >> 16));
-		slen = snprintf(string + pos, size - pos, "%06"PRIx32"", rgbcolour);
+		slen = snprintf(string + pos, size - pos, "%06"PRIx32, rgbcolour);
 		break;
 
 	case OPTION_STRING: