diff --git a/src/bip.c b/src/bip.c
index 1871aed..34584d4 100644
--- a/src/bip.c
+++ b/src/bip.c
@@ -82,7 +82,12 @@ static void hash_binary(char *hex, unsigned char **password, unsigned int *seed)
 	md5 = bip_malloc((size_t) 20);
 	for (i = 0; i < 20; i++) {
 		sscanf(hex + 2 * i, "%02x", &buf);
+// conversion from ‘unsigned int’ to ‘unsigned char’ may change value
+// we're parsing a text (hex) so buf won't ever be something else than a char
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wconversion"
 		md5[i] = buf;
+#pragma GCC diagnostic pop
 	}
 
 	*seed = 0;
diff --git a/src/irc.c b/src/irc.c
index a4cee2e..3729271 100644
--- a/src/irc.c
+++ b/src/irc.c
@@ -24,6 +24,9 @@
 #include "md5.h"
 #include "utils/base64.h"
 
+// TODO resolve assuming signed overflow does not occur when changing X +- C1 cmp C2 to X cmp C2 -+ C1
+#pragma GCC diagnostic ignored "-Wstrict-overflow"
+
 #define S_CONN_DELAY (10)
 
 extern int sighup;
diff --git a/src/line.c b/src/line.c
index ff07743..dd79eb7 100644
--- a/src/line.c
+++ b/src/line.c
@@ -16,6 +16,9 @@
 #include "line.h"
 #include "util.h"
 
+// TODO resolve assuming signed overflow does not occur when changing X +- C1 cmp C2 to X cmp C2 -+ C1
+#pragma GCC diagnostic ignored "-Wstrict-overflow"
+
 void irc_line_init(struct line *l)
 {
 	memset(l, 0, sizeof(struct line));
diff --git a/src/md5.c b/src/md5.c
index e408157..03d0985 100644
--- a/src/md5.c
+++ b/src/md5.c
@@ -360,7 +360,11 @@ unsigned char *chash_double(char *str, unsigned int seed)
 	length = strlen(str);
 	length += 4;
 	ptr = bip_malloc(length);
+// conversion from ‘unsigned int’ to ‘unsigned char’ may change value [-Werror=conversion]
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wconversion"
 	ptr[0] = seed >> 24 & 0xff;
+#pragma GCC diagnostic pop
 	ptr[1] = seed >> 16 & 0xff;
 	ptr[2] = seed >> 8 & 0xff;
 	ptr[3] = seed & 0xff;
diff --git a/src/util.h b/src/util.h
index bb84710..41d3cc5 100644
--- a/src/util.h
+++ b/src/util.h
@@ -43,11 +43,14 @@ struct list_item {
 	void *ptr;
 };
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wstrict-prototypes"
 typedef struct list {
 	struct list_item *first;
 	struct list_item *last;
 	int (*cmp)();
 } list_t;
+#pragma GCC diagnostic pop
 
 typedef struct list_iterator {
 	list_t *list;