diff --git a/R/parse.R b/R/parse.R
index 8993996..b2eee66 100644
--- a/R/parse.R
+++ b/R/parse.R
@@ -12,8 +12,7 @@ parse_log <- function(filename) {
     calls <- unique(proflog, fromLast = TRUE)
     if (metadata$line.profiling) {
         ind <- grep("#File ", calls, fixed = TRUE)
-        fnames <- strsplit(calls[ind], ": ", fixed = TRUE)
-        fnames <- vapply(fnames, .subset2, 2L, FUN.VALUE = "")
+        fnames <- sub("#File \\d+: ?", "", calls[ind])
         calls <- calls[-ind]
         tmp <- strsplit(gsub(".*(\\d#\\d).*", "\\1", calls), "#", fixed = TRUE)
         tmp <- lapply(tmp, as.integer)
@@ -39,7 +38,7 @@ parse_log <- function(filename) {
 get_prof_info <- function(firstline) {
     list(line.profiling = grepl("line profiling", firstline, fixed = TRUE),
          memory.profiling = grepl("memory profiling", firstline, fixed = TRUE),
-         gc.profiling = grepl("gc profiling", firstline, fixed = TRUE),
+         gc.profiling = grepl("GC profiling", firstline, fixed = TRUE),
          interval = as.numeric(strsplit(firstline, "=", fixed = TRUE)[[1L]][2L]) / 1e6)
 }
 
diff --git a/R/prof-tree.R b/R/prof-tree.R
index 2b793bc..4657703 100644
--- a/R/prof-tree.R
+++ b/R/prof-tree.R
@@ -24,7 +24,7 @@ prof.tree <- function(filename = "Rprof.out") {
             traversal = "post-order", filterFun = isNotLeaf)
     tree$Do(function(node) node$env <- get_envname(node$name), filterFun = isNotRoot)
     tree$Do(function(node) node$name <- sprintf("`%s`", node$name), filterFun = isNotRoot)
-    if ("line" %in% res$fieldsAll) {
+    if ("line" %in% tree$fieldsAll) {
         tree$Do(function(node) node$file <- node$parent$file,
                 traversal = "pre-order", filterFun = function(node) is.null(node$file))
         tree$Do(function(node) node$line <- node$parent$line,
@@ -42,7 +42,7 @@ prof.tree <- function(filename = "Rprof.out") {
 #' @export
 #'
 print.ProfTree <- function(x, limit = 25, ...) {
-    if ("line" %in% res$fieldsAll)
+    if ("line" %in% x$fieldsAll)
         NextMethod("print", x, "real", "percent", "env", "file", "line",
                    pruneMethod = "dist", limit = limit)
     else