diff --git a/src/config.c b/src/config.c
index 9e62df0c5..ec350f8fd 100644
--- a/src/config.c
+++ b/src/config.c
@@ -394,12 +394,15 @@ int git_config_get_long(git_config *cfg, const char *name, long int *out)
 	case '\0':
 		break;
 	case 'k':
+	case 'K':
 		num *= 1024;
 		break;
 	case 'm':
+	case 'M':
 		num *= 1024 * 1024;
 		break;
 	case 'g':
+	case 'G':
 		num *= 1024 * 1024 * 1024;
 		break;
 	default:
diff --git a/tests/resources/config/config5 b/tests/resources/config/config5
index 645fe7645..8ab60ccec 100644
Binary files a/tests/resources/config/config5 and b/tests/resources/config/config5 differ
diff --git a/tests/t15-config.c b/tests/t15-config.c
index 1cf4b418f..8e0d3215c 100644
--- a/tests/t15-config.c
+++ b/tests/t15-config.c
@@ -142,12 +142,21 @@ BEGIN_TEST(config5, "test number suffixes")
 	must_pass(git_config_get_long(cfg, "number.k", &i));
 	must_be_true(i == 1 * 1024);
 
+	must_pass(git_config_get_long(cfg, "number.kk", &i));
+	must_be_true(i == 1 * 1024);
+
 	must_pass(git_config_get_long(cfg, "number.m", &i));
 	must_be_true(i == 1 * 1024 * 1024);
 
+	must_pass(git_config_get_long(cfg, "number.mm", &i));
+	must_be_true(i == 1 * 1024 * 1024);
+
 	must_pass(git_config_get_long(cfg, "number.g", &i));
 	must_be_true(i == 1 * 1024 * 1024 * 1024);
 
+	must_pass(git_config_get_long(cfg, "number.gg", &i));
+	must_be_true(i == 1 * 1024 * 1024 * 1024);
+
 	git_config_free(cfg);
 END_TEST