diff --git a/src/xrt/auxiliary/util/u_config_json.c b/src/xrt/auxiliary/util/u_config_json.c
index e8dd818e1..d89a720ce 100644
--- a/src/xrt/auxiliary/util/u_config_json.c
+++ b/src/xrt/auxiliary/util/u_config_json.c
@@ -61,7 +61,7 @@ u_config_json_open_or_create_file(struct u_config_json *json, const char *filena
 
 	json->file_loaded = true;
 
-	char *str = u_file_read_content(file);
+	char *str = u_file_read_content(file, NULL);
 	fclose(file);
 	if (str == NULL) {
 		U_LOG_E("Could not read the contents of '%s'!", tmp);
diff --git a/src/xrt/auxiliary/util/u_file.c b/src/xrt/auxiliary/util/u_file.c
index f1d5697e9..06241aecf 100644
--- a/src/xrt/auxiliary/util/u_file.c
+++ b/src/xrt/auxiliary/util/u_file.c
@@ -218,7 +218,7 @@ u_file_get_path_in_runtime_dir(const char *suffix, char *out_path, size_t out_pa
 }
 
 char *
-u_file_read_content(FILE *file)
+u_file_read_content(FILE *file, size_t *out_file_size)
 {
 	// Go to the end of the file.
 	fseek(file, 0L, SEEK_END);
@@ -239,17 +239,20 @@ u_file_read_content(FILE *file)
 		return NULL;
 	}
 
+	if (out_file_size)
+		*out_file_size = file_size;
+
 	return buffer;
 }
 
 char *
-u_file_read_content_from_path(const char *path)
+u_file_read_content_from_path(const char *path, size_t *out_file_size)
 {
 	FILE *file = fopen(path, "rb");
 	if (file == NULL) {
 		return NULL;
 	}
-	char *file_content = u_file_read_content(file);
+	char *file_content = u_file_read_content(file, out_file_size);
 	int ret = fclose(file);
 	// We don't care about the return value since we're just reading
 	(void)ret;
diff --git a/src/xrt/auxiliary/util/u_file.h b/src/xrt/auxiliary/util/u_file.h
index 753a334db..ae7117863 100644
--- a/src/xrt/auxiliary/util/u_file.h
+++ b/src/xrt/auxiliary/util/u_file.h
@@ -38,10 +38,10 @@ ssize_t
 u_file_get_runtime_dir(char *out_path, size_t out_path_size);
 
 char *
-u_file_read_content(FILE *file);
+u_file_read_content(FILE *file, size_t *out_file_size);
 
 char *
-u_file_read_content_from_path(const char *path);
+u_file_read_content_from_path(const char *path, size_t *out_file_size);
 
 ssize_t
 u_file_get_path_in_runtime_dir(const char *suffix, char *out_path, size_t out_path_size);
diff --git a/src/xrt/targets/common/target_builder_north_star.c b/src/xrt/targets/common/target_builder_north_star.c
index 87261543f..a4a24b04c 100644
--- a/src/xrt/targets/common/target_builder_north_star.c
+++ b/src/xrt/targets/common/target_builder_north_star.c
@@ -116,7 +116,7 @@ struct ns_builder
 static bool
 ns_config_load(struct ns_builder *nsb)
 {
-	const char *file_content = u_file_read_content_from_path(nsb->config_path);
+	const char *file_content = u_file_read_content_from_path(nsb->config_path, NULL);
 	if (file_content == NULL) {
 		U_LOG_E("The file at \"%s\" was unable to load. Either there wasn't a file there or it was empty.",
 		        nsb->config_path);
diff --git a/src/xrt/targets/common/target_builder_simulavr.c b/src/xrt/targets/common/target_builder_simulavr.c
index 3ae7e07fe..914c1b339 100644
--- a/src/xrt/targets/common/target_builder_simulavr.c
+++ b/src/xrt/targets/common/target_builder_simulavr.c
@@ -71,7 +71,7 @@ process_poly_values(const cJSON *values, struct svr_display_distortion_polynomia
 static bool
 process_config(const char *config_path, struct svr_two_displays_distortion *out_dist)
 {
-	char *file_content = u_file_read_content_from_path(config_path);
+	char *file_content = u_file_read_content_from_path(config_path, NULL);
 	if (file_content == NULL) {
 		U_LOG_E("The file at \"%s\" was unable to load. Either there wasn't a file there or it was empty.",
 		        config_path);