diff --git a/src/libzzuf.c b/src/libzzuf.c
index ad837ec..cc024e4 100644
--- a/src/libzzuf.c
+++ b/src/libzzuf.c
@@ -39,6 +39,7 @@
 
 /* Global variables */
 int   _zz_ready    = 0;
+int   _zz_disabled = 0;
 int   _zz_hasdebug = 0;
 float _zz_ratio    = 0.004f;
 int   _zz_seed     = 0;
diff --git a/src/libzzuf.h b/src/libzzuf.h
index c029c8b..6d3ab7d 100644
--- a/src/libzzuf.h
+++ b/src/libzzuf.h
@@ -33,6 +33,7 @@ struct fuzz
 
 /* Internal variables */
 extern int   _zz_ready;
+extern int   _zz_disabled;
 extern int   _zz_hasdebug;
 extern float _zz_ratio;
 extern int   _zz_seed;
diff --git a/src/load-fd.c b/src/load-fd.c
index 9b6e2dc..0f8e31f 100644
--- a/src/load-fd.c
+++ b/src/load-fd.c
@@ -85,7 +85,7 @@ void _zz_load_fd(void)
         { \
             ret = ORIG(fn)(file, oflag); \
         } \
-        if(!_zz_ready) \
+        if(!_zz_ready || _zz_disabled) \
             return ret; \
         if(ret >= 0 \
             && ((oflag & (O_RDONLY | O_RDWR | O_WRONLY)) != O_WRONLY) \
@@ -119,7 +119,7 @@ ssize_t read(int fd, void *buf, size_t count)
     if(!_zz_ready)
         LOADSYM(read);
     ret = read_orig(fd, buf, count);
-    if(!_zz_ready || !_zz_iswatched(fd))
+    if(!_zz_ready || !_zz_iswatched(fd) || _zz_disabled)
         return ret;
 
     debug("read(%i, %p, %li) = %i", fd, buf, (long int)count, ret);
@@ -145,7 +145,7 @@ ssize_t read(int fd, void *buf, size_t count)
         if(!_zz_ready) \
             LOADSYM(fn); \
         ret = ORIG(fn)(fd, offset, whence); \
-        if(!_zz_ready || !_zz_iswatched(fd)) \
+        if(!_zz_ready || !_zz_iswatched(fd) || _zz_disabled) \
             return ret; \
         debug(STR(fn)"(%i, %lli, %i) = %lli", \
               fd, (long long int)offset, whence, (long long int)ret); \
@@ -181,7 +181,7 @@ int close(int fd)
         return 0;
 
     ret = close_orig(fd);
-    if(!_zz_ready || !_zz_iswatched(fd))
+    if(!_zz_ready || !_zz_iswatched(fd) || _zz_disabled)
         return ret;
 
     debug("close(%i) = %i", fd, ret);
diff --git a/src/load-stream.c b/src/load-stream.c
index 6641c14..8dd7bf0 100644
--- a/src/load-stream.c
+++ b/src/load-stream.c
@@ -95,7 +95,9 @@ void _zz_load_stream(void)
             LOADSYM(fn); \
             return ORIG(fn)(path, mode); \
         } \
+        _zz_disabled = 1; \
         ret = ORIG(fn)(path, mode); \
+        _zz_disabled = 0; \
         if(ret && _zz_mustwatch(path)) \
         { \
             int fd = fileno(ret); \
@@ -126,7 +128,9 @@ int fseek(FILE *stream, long offset, int whence)
     if(!_zz_ready || !_zz_iswatched(fd))
         return fseek_orig(stream, offset, whence);
 
+    _zz_disabled = 1;
     ret = fseek_orig(stream, offset, whence);
+    _zz_disabled = 0;
     debug("fseek([%i], %li, %i) = %i", fd, offset, whence, ret);
     if(ret != 0)
         return ret;
@@ -159,7 +163,9 @@ size_t fread(void *ptr, size_t size, size_t nmemb, FILE *stream)
         return fread_orig(ptr, size, nmemb, stream);
 
     pos = ftell(stream);
+    _zz_disabled = 1;
     ret = fread_orig(ptr, size, nmemb, stream);
+    _zz_disabled = 0;
     debug("fread(%p, %li, %li, [%i]) = %li",
           ptr, (long int)size, (long int)nmemb, fd, (long int)ret);
     if(ret >= 0)
@@ -184,7 +190,9 @@ size_t fread(void *ptr, size_t size, size_t nmemb, FILE *stream)
         fd = fileno(stream); \
         if(!_zz_ready || !_zz_iswatched(fd)) \
             return ORIG(fn)(stream); \
+        _zz_disabled = 1; \
         ret = ORIG(fn)(stream); \
+        _zz_disabled = 0; \
         if(ret != EOF) \
         { \
             uint8_t ch = ret; \
@@ -227,7 +235,11 @@ char *fgets(char *s, int size, FILE *stream)
     {
         for(i = 0; i < size - 1; i++)
         {
-            int ch = fgetc_orig(stream);
+            int ch;
+
+            _zz_disabled = 1;
+            ch = fgetc_orig(stream);
+            _zz_disabled = 0;
 
             if(ch == EOF)
             {
@@ -286,7 +298,9 @@ int fclose(FILE *fp)
     if(!_zz_ready || !_zz_iswatched(fd))
         return fclose_orig(fp);
 
+    _zz_disabled = 1;
     ret = fclose_orig(fp);
+    _zz_disabled = 0;
     debug("fclose([%i]) = %i", fd, ret);
     _zz_unregister(fd);
 
@@ -318,7 +332,9 @@ int fclose(FILE *fp)
                 *lineptr = line; \
                 break; \
             } \
+            _zz_disabled = 1; \
             ch = fgetc_orig(stream); \
+            _zz_disabled = 0; \
             if(ch == EOF) \
             { \
                 finished = 1; \