diff --git a/Makefile b/Makefile
index f7fa246..081960f 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 CC=gcc
-CFLAGS=-std=c99 -Wall -O2 -static -g
+CFLAGS=-std=c99 -Wall -O0 -static
 CLIBS=-lm
 PRGNAME=bfckr
 CFILES=$(shell find . -name '*.c')
@@ -9,17 +9,24 @@ RUN=valgrind --leak-check=full
 DEBUG=gdb --args
 ARGS="examples/rot13.bf"
 
-all: build run
+all: build
 
 clean:
 	$(STYLE) $(CFILES)
 	rm -f *.o
 	rm -f $(PRGNAME)
+
 build:
 	$(CC) $(CFLAGS) $(CLIBS) -o $(PRGNAME) -Isrc $(CFILES)
+
+debug:
+	$(CC) $(CFLAGS) -g $(CLIBS) -o $(PRGNAME) -Isrc $(CFILES)
+
+run_debug:
+	$(DEBUG) ./$(PRGNAME) $(ARGS)
+
 run:
 	./$(PRGNAME) $(ARGS)
+
 memtest:
 	$(RUN) ./$(PRGNAME) $(ARGS)
-debug:
-	$(DEBUG) ./$(PRGNAME) $(ARGS)
diff --git a/bfckr.c b/bfckr.c
index 298aa4b..ca611e6 100644
--- a/bfckr.c
+++ b/bfckr.c
@@ -30,7 +30,7 @@ void die(const char *message)
     if(errno) {
         perror(message);
     } else {
-        printf("[:-(] Error: %s\n", message);
+        printf("[:(] Error: %s\n", message);
     }
 
     exit(EXIT_FAILURE);
@@ -71,8 +71,7 @@ void bfuck_parser(char *input)
             if(*p == 0) { // if the byte at the data pointer is zero
                 // jump forward to the command after the next ]
                 loop = 1;
-                // jump back to the command after the matching [
-                while(loop > 0) {
+                while(loop > 0) { // count nested loops and make sure to get the matching ]
                     i++;
                     if(input[i] == '[') {
                         loop++;
@@ -88,9 +87,9 @@ void bfuck_parser(char *input)
 
         case ']':
             if(*p != 0) { // if the byte at the data pointer is nonzero
-                loop = 1;
                 // jump back to the command after the matching [
-                while(loop > 0) {
+                loop = 1;
+                while(loop > 0) { // count nested loops and make sure to get the matching [
                     i--;
                     if(input[i] == '[') {
                         loop--;
@@ -129,15 +128,17 @@ int main(int argc, char* argv[])
         die("Couldn't open file.");
     }
 
-    // read the whole file and store it in the input buffer
+    // read the file and store it in the input buffer
     while((c = getc(fp)) != EOF) {
         input[i++] = c;
     }
 
+    // close file after reading
+    fclose(fp);
+
     // try to interpret it
     bfuck_parser(input);
 
-    // close and exit
-    fclose(fp);
+    // exit
     exit(EXIT_SUCCESS);
 }