diff --git a/vvm/src/vm.c b/vvm/src/vm.c
index 780017f..2d516ed 100644
--- a/vvm/src/vm.c
+++ b/vvm/src/vm.c
@@ -180,8 +180,9 @@ program vm_parse(char *filename){
 
     while(getline(&line, &linelength, file) != -1){
         short found = FALSE;
+        unsigned int elemc = 0;
         strtok(line, "\n");
-        command = str_split(line, ' ');
+        command = str_split(line, ' ', &elemc);
 
         if(codep == size){
             size += 100;
@@ -202,6 +203,12 @@ program vm_parse(char *filename){
 
             if(found && ins[i].operands > 0){
                 int nargs = ins[i].operands;
+                if(nargs != elemc-1){
+                    fprintf(stderr, 
+                            "Line %s called with wrong number of arguments\
+                            (got %d, expected %d)\n", line, elemc-1, nargs);
+                    die(127, "Compilation failed.");
+                }
                 for(i = 1; i <= nargs; i++){
                     code[codep++] = (int) strtol(command[i], (char **) NULL, 10);
                 }
@@ -221,9 +228,8 @@ program vm_parse(char *filename){
     return prog;
 }
 
-char** str_split(char* a_str, const char a_delim){
+char** str_split(char* a_str, const char a_delim, unsigned int* elemc){
     char** result    = 0;
-    size_t count     = 0;
     char* tmp        = a_str;
     char* last_comma = 0;
     char delim[2];
@@ -232,30 +238,32 @@ char** str_split(char* a_str, const char a_delim){
 
     while (*tmp){
         if (a_delim == *tmp){
-            count++;
+            (*elemc)++;
             last_comma = tmp;
         }
         tmp++;
     }
 
-    count += last_comma < (a_str + strlen(a_str) - 1);
+    *elemc += last_comma < (a_str + strlen(a_str) - 1);
 
-    count++;
+    (*elemc)++;
 
-    result = malloc(sizeof(char*) * count);
+    result = malloc(sizeof(char*) * *elemc);
 
     if (result){
         size_t idx  = 0;
         char* token = strtok(a_str, delim);
 
         while (token){
-            assert(idx < count);
+            assert(idx < *elemc);
             *(result + idx++) = strdup(token);
             token = strtok(0, delim);
         }
-        assert(idx == count - 1);
+        assert(idx == *elemc - 1);
         *(result + idx) = 0;
     }
 
+    (*elemc)--;
+
     return result;
 }
diff --git a/vvm/src/vm.h b/vvm/src/vm.h
index d64c09a..27d4f08 100644
--- a/vvm/src/vm.h
+++ b/vvm/src/vm.h
@@ -38,6 +38,13 @@ void vm_execute(int[], int, int, unsigned long);
  */
 program vm_parse(char*);
 
-char** str_split(char*, const char);
+/**
+ * @brief str_split
+ * @param a_str -> the input string
+ * @param a_delim -> the delimiter
+ * @param elemc -> the counter of elements
+ *
+ */
+char** str_split(char*, const char, unsigned int*);
 
 #endif
diff --git a/vvm/test.sh b/vvm/test.sh
index ba08ff7..0ecb914 100755
--- a/vvm/test.sh
+++ b/vvm/test.sh
@@ -1,9 +1,29 @@
 #!/bin/bash
 
-for i in `ls test` ; do 
+for i in `ls test | grep -v fail` ; do 
     echo Running test $i:
     echo ---------------------
     bin/vvm test/$i
+    return=$?
+    if [ $return != 0 ] ; then
+        echo Test $i failed.
+        exit 1
+    fi
+    echo
+    echo ---------------------
+    echo End of test $i 
+    echo
+done
+
+for i in `ls test/*fail*` ; do 
+    echo Running expected fail test $i:
+    echo ---------------------
+    bin/vvm $i
+    return=$?
+    if [ $return != 127 ] ; then
+        echo Test $i failed.
+        exit 1
+    fi
     echo
     echo ---------------------
     echo End of test $i