diff --git a/tests/ctests/test_netplan_error.c b/tests/ctests/test_netplan_error.c
index 3794f68ab..01bc1c6f3 100644
--- a/tests/ctests/test_netplan_error.c
+++ b/tests/ctests/test_netplan_error.c
@@ -26,7 +26,7 @@ test_netplan_error_code(__unused void** state)
 {
     GError *gerror = g_error_new(1234, 5678, "%s: error message", "it failed");
     uint64_t error_code = netplan_error_code(gerror);
-    GQuark domain = error_code >> 32;
+    GQuark domain = (GQuark)(error_code >> 32);
     gint error = (gint) error_code;
 
     assert_int_equal(domain, 1234);
diff --git a/tests/ctests/test_netplan_keyfile.c b/tests/ctests/test_netplan_keyfile.c
index 7b1cbecc3..2cda89efb 100644
--- a/tests/ctests/test_netplan_keyfile.c
+++ b/tests/ctests/test_netplan_keyfile.c
@@ -260,8 +260,8 @@ test_load_keyfile_utf8_password(__unused void** state)
 {
     NetplanState *np_state = NULL;
     int fd;
-    int size;
-    int res;
+    size_t size;
+    ssize_t res;
     char* yaml;
 
     const char* keyfile =
@@ -306,7 +306,7 @@ test_load_keyfile_utf8_password(__unused void** state)
 
     netplan_state_dump_yaml(np_state, fd, NULL);
 
-    size = lseek(fd, 0, SEEK_CUR) + 1;
+    size = (size_t)lseek(fd, 0, SEEK_CUR) + 1;
     yaml = malloc(size);
     memset(yaml, 0, size);
     lseek(fd, 0, SEEK_SET);
diff --git a/tests/ctests/test_netplan_parser.c b/tests/ctests/test_netplan_parser.c
index b04e228e7..d8020e420 100644
--- a/tests/ctests/test_netplan_parser.c
+++ b/tests/ctests/test_netplan_parser.c
@@ -389,8 +389,8 @@ test_parse_utf8_characters(__unused void** state)
 {
     NetplanState *np_state = NULL;
     int fd;
-    int size;
-    int res;
+    size_t size;
+    ssize_t res;
 
     char* yaml =
         "network:\n"
@@ -418,7 +418,7 @@ test_parse_utf8_characters(__unused void** state)
 
     netplan_state_dump_yaml(np_state, fd, NULL);
 
-    size = lseek(fd, 0, SEEK_CUR) + 1;
+    size = (size_t)lseek(fd, 0, SEEK_CUR) + 1;
     yaml = malloc(size);
     memset(yaml, 0, size);
     lseek(fd, 0, SEEK_SET);