diff --git a/drivers/atmodem/sim.c b/drivers/atmodem/sim.c
index 7b8cede3..bb080eb0 100644
--- a/drivers/atmodem/sim.c
+++ b/drivers/atmodem/sim.c
@@ -82,7 +82,7 @@ static void at_crsm_info_cb(gboolean ok, GAtResult *result, gpointer user_data)
 
 	ofono_debug("crsm_info_cb: %02x, %02x, %i", sw1, sw2, len);
 
-	sim_parse_2G_get_response(response, len, &flen, &rlen, &str, access);
+	sim_parse_2g_get_response(response, len, &flen, &rlen, &str, access);
 
 	cb(&error, flen, str, rlen, access, cbd->data);
 }
diff --git a/src/simutil.c b/src/simutil.c
index c294489e..c9188468 100644
--- a/src/simutil.c
+++ b/src/simutil.c
@@ -574,7 +574,7 @@ struct sim_ef_info *sim_ef_db_lookup(unsigned short id)
 	return result;
 }
 
-gboolean sim_parse_3G_get_response(unsigned char *data, int len,
+gboolean sim_parse_3g_get_response(unsigned char *data, int len,
 					int *file_len, int *record_len,
 					int *structure, unsigned char *access,
 					unsigned short *efid)
@@ -683,7 +683,7 @@ gboolean sim_parse_3G_get_response(unsigned char *data, int len,
 	return TRUE;
 }
 
-gboolean sim_parse_2G_get_response(unsigned char *response, int len,
+gboolean sim_parse_2g_get_response(unsigned char *response, int len,
 					int *file_len, int *record_len,
 					int *structure, unsigned char *access)
 {
diff --git a/src/simutil.h b/src/simutil.h
index 843490fa..7001e19c 100644
--- a/src/simutil.h
+++ b/src/simutil.h
@@ -107,11 +107,11 @@ void sim_adn_build(unsigned char *data, int length,
 
 struct sim_ef_info *sim_ef_db_lookup(unsigned short efid);
 
-gboolean sim_parse_3G_get_response(unsigned char *data, int len,
+gboolean sim_parse_3g_get_response(unsigned char *data, int len,
 					int *file_len, int *record_len,
 					int *structure, unsigned char *access,
 					unsigned short *efid);
 
-gboolean sim_parse_2G_get_response(unsigned char *response, int len,
+gboolean sim_parse_2g_get_response(unsigned char *response, int len,
 					int *file_len, int *record_len,
 					int *structure, unsigned char *access);
diff --git a/unit/test-simutil.c b/unit/test-simutil.c
index 97ec3454..a5703d87 100644
--- a/unit/test-simutil.c
+++ b/unit/test-simutil.c
@@ -108,7 +108,7 @@ static void test_3g_status_data()
 
 	response = decode_hex(binary_ef, -1, &len, 0);
 
-	sim_parse_3G_get_response(response, len, &flen, &rlen, &str,
+	sim_parse_3g_get_response(response, len, &flen, &rlen, &str,
 					access, &efid);
 
 	g_assert(flen == 10);
@@ -123,7 +123,7 @@ static void test_3g_status_data()
 
 	response = decode_hex(record_ef, -1, &len, 0);
 
-	sim_parse_3G_get_response(response, len, &flen, &rlen, &str,
+	sim_parse_3g_get_response(response, len, &flen, &rlen, &str,
 					access, &efid);
 
 	g_assert(flen == 0x80);