diff --git a/main/conversions.c b/main/conversions.c
index 007e24d758..4b58140fd3 100644
--- a/main/conversions.c
+++ b/main/conversions.c
@@ -99,7 +99,7 @@ int ast_str_to_imax(const char *str, intmax_t *res)
 	}
 
 	errno = 0;
-	val = strtoimax(str, &end, 0);
+	val = strtoimax(str, &end, 10);
 
 	/*
 	 * If str equals end then no digits were found. If end is not pointing to
@@ -126,7 +126,7 @@ int ast_str_to_umax(const char *str, uintmax_t *res)
 	}
 
 	errno = 0;
-	val = strtoumax(str, &end, 0);
+	val = strtoumax(str, &end, 10);
 
 	/*
 	 * If str equals end then no digits were found. If end is not pointing to
diff --git a/tests/test_conversions.c b/tests/test_conversions.c
index f49c8e6800..7ec1731c94 100644
--- a/tests/test_conversions.c
+++ b/tests/test_conversions.c
@@ -48,6 +48,7 @@ AST_TEST_DEFINE(str_to_int)
 	const char *spaces = "  ";
 	const char *valid = "7";
 	const char *valid_spaces = "  7";
+	const char *valid_decimal = "08";
 	int val;
 	char str[64];
 
@@ -73,6 +74,7 @@ AST_TEST_DEFINE(str_to_int)
 	ast_test_validate(test, ast_str_to_int(spaces, &val));
 	ast_test_validate(test, !ast_str_to_int(valid, &val));
 	ast_test_validate(test, !ast_str_to_int(valid_spaces, &val));
+	ast_test_validate(test, !ast_str_to_int(valid_decimal, &val));
 
 	ast_test_validate(test, snprintf(str, sizeof(str), "%d", INT_MAX) > 0);
 	ast_test_validate(test, !ast_str_to_int(str, &val));
@@ -95,6 +97,7 @@ AST_TEST_DEFINE(str_to_uint)
 	const char *spaces = "  ";
 	const char *valid = "7";
 	const char *valid_spaces = "  7";
+	const char *valid_decimal = "08";
 	unsigned int val;
 	char str[64];
 
@@ -119,6 +122,7 @@ AST_TEST_DEFINE(str_to_uint)
 	ast_test_validate(test, ast_str_to_uint(spaces, &val));
 	ast_test_validate(test, !ast_str_to_uint(valid, &val));
 	ast_test_validate(test, !ast_str_to_uint(valid_spaces, &val));
+	ast_test_validate(test, !ast_str_to_uint(valid_decimal, &val));
 
 	ast_test_validate(test, snprintf(str, sizeof(str), "%u", UINT_MAX) > 0);
 	ast_test_validate(test, !ast_str_to_uint(str, &val));
@@ -138,6 +142,7 @@ AST_TEST_DEFINE(str_to_long)
 	const char *spaces = "  ";
 	const char *valid = "7";
 	const char *valid_spaces = "  7";
+	const char *valid_decimal = "08";
 	long val;
 	char str[64];
 
@@ -163,6 +168,7 @@ AST_TEST_DEFINE(str_to_long)
 	ast_test_validate(test, ast_str_to_long(spaces, &val));
 	ast_test_validate(test, !ast_str_to_long(valid, &val));
 	ast_test_validate(test, !ast_str_to_long(valid_spaces, &val));
+	ast_test_validate(test, !ast_str_to_long(valid_decimal, &val));
 
 	ast_test_validate(test, snprintf(str, sizeof(str), "%ld", LONG_MAX) > 0);
 	ast_test_validate(test, !ast_str_to_long(str, &val));
@@ -185,6 +191,7 @@ AST_TEST_DEFINE(str_to_ulong)
 	const char *spaces = "  ";
 	const char *valid = "7";
 	const char *valid_spaces = "  7";
+	const char *valid_decimal = "08";
 	unsigned long val;
 	char str[64];
 
@@ -209,6 +216,7 @@ AST_TEST_DEFINE(str_to_ulong)
 	ast_test_validate(test, ast_str_to_ulong(spaces, &val));
 	ast_test_validate(test, !ast_str_to_ulong(valid, &val));
 	ast_test_validate(test, !ast_str_to_ulong(valid_spaces, &val));
+	ast_test_validate(test, !ast_str_to_ulong(valid_decimal, &val));
 
 	ast_test_validate(test, snprintf(str, sizeof(str), "%lu", ULONG_MAX) > 0);
 	ast_test_validate(test, !ast_str_to_ulong(str, &val));
@@ -228,6 +236,7 @@ AST_TEST_DEFINE(str_to_imax)
 	const char *spaces = "  ";
 	const char *valid = "7";
 	const char *valid_spaces = "  7";
+	const char *valid_decimal = "08";
 	intmax_t val;
 	char str[64];
 
@@ -253,6 +262,7 @@ AST_TEST_DEFINE(str_to_imax)
 	ast_test_validate(test, ast_str_to_imax(spaces, &val));
 	ast_test_validate(test, !ast_str_to_imax(valid, &val));
 	ast_test_validate(test, !ast_str_to_imax(valid_spaces, &val));
+	ast_test_validate(test, !ast_str_to_imax(valid_decimal, &val));
 
 	ast_test_validate(test, snprintf(str, sizeof(str), "%jd", INTMAX_MAX) > 0);
 	ast_test_validate(test, !ast_str_to_imax(str, &val));
@@ -276,6 +286,7 @@ AST_TEST_DEFINE(str_to_umax)
 	const char *spaces = "  ";
 	const char *valid = "7";
 	const char *valid_spaces = "  7";
+	const char *valid_decimal = "08";
 	uintmax_t val;
 	char str[64];
 
@@ -300,6 +311,7 @@ AST_TEST_DEFINE(str_to_umax)
 	ast_test_validate(test, ast_str_to_umax(spaces, &val));
 	ast_test_validate(test, !ast_str_to_umax(valid, &val));
 	ast_test_validate(test, !ast_str_to_umax(valid_spaces, &val));
+	ast_test_validate(test, !ast_str_to_umax(valid_decimal, &val));
 
 	ast_test_validate(test, snprintf(str, sizeof(str), "%ju", UINTMAX_MAX) > 0);
 	ast_test_validate(test, !ast_str_to_umax(str, &val));