diff --git a/src/lib.rs b/src/lib.rs
index 7496232..d9fff93 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -12,9 +12,13 @@ const VERSION: &str = "2.0.0";
 
 extern "C" {
     fn nmseffect_set_clearscr(_: c_int) -> c_void;
-    fn nmseffect_exec(input: *const c_char, len: c_int, autodecrypt_c: c_int) -> c_char;
+    fn nmseffect_exec(
+        input: *const c_char,
+        len: c_int,
+        autodecrypt_c: c_int,
+        maskblank_c: c_int,
+    ) -> c_char;
     static mut foregroundColor: c_int;
-    static mut maskBlank: c_int;
 }
 
 ///Sleep for the number of milliseconds indicated by argument
@@ -61,13 +65,7 @@ pub extern "C" fn rust_main() {
             foregroundColor = n;
         }
     }
-    unsafe {
-        if args.mask_blanks {
-            maskBlank = 1;
-        } else {
-            maskBlank = 0;
-        }
-    }
+    let maskblank_c = if args.mask_blanks { 1 } else { 0 };
 
     if args.clear_screen {
         unsafe {
@@ -85,7 +83,7 @@ pub extern "C" fn rust_main() {
     let output_cstring = CString::new(output).unwrap();
     let ptr = output_cstring.as_ptr();
     let len = output_cstring.as_bytes().len();
-    let _r = unsafe { nmseffect_exec(ptr, len as i32, autodecrypt_c) };
+    let _r = unsafe { nmseffect_exec(ptr, len as i32, autodecrypt_c, maskblank_c) };
 }
 
 fn get_input(prompt: &str) -> String {
diff --git a/src/nmseffect.c b/src/nmseffect.c
index 1800ac4..405c604 100644
--- a/src/nmseffect.c
+++ b/src/nmseffect.c
@@ -32,7 +32,6 @@
 #define REVEAL_LOOP_SPEED    50    // miliseconds between each reveal loop
 
 // Behavior settings
-int maskBlank        = 0;            // Mask blank spaces
 const int colorOn          = 1;            // Terminal color flag - nothing actually sets this to be false ever
 
 // Character attribute structure, linked list. Keeps track of every
@@ -54,7 +53,7 @@ extern void nmseffect_sleep(int);
  * string that is provided as an argument. It returns the last character
  * pressed by the user.
  */
-char nmseffect_exec(unsigned char *string, int string_len, int autoDecrypt) {
+char nmseffect_exec(unsigned char *string, int string_len, int autoDecrypt, int maskBlank) {
 	struct charAttr *list_pointer = NULL;
 	struct charAttr *list_head    = NULL;
 	struct charAttr *list_temp    = NULL;
diff --git a/src/nmseffect.h b/src/nmseffect.h
index 2a9592b..6d520b7 100644
--- a/src/nmseffect.h
+++ b/src/nmseffect.h
@@ -9,7 +9,7 @@
 #define NMSEFFECT_H 1
 
 // Function prototypes
-char nmseffect_exec(unsigned char *, int string_len, int autoDecrypt);
+char nmseffect_exec(unsigned char *, int string_len, int autoDecrypt, int maskblank);
 void nmseffect_set_returnopts(char *);
 void nmseffect_set_clearscr(int);
 void nmseffect_use_color(int);