diff --git a/dsdump/XRMachOLibrary.mm b/dsdump/XRMachOLibrary.mm
index 860393a2..16d9e342 100644
--- a/dsdump/XRMachOLibrary.mm
+++ b/dsdump/XRMachOLibrary.mm
@@ -280,6 +280,12 @@ - (instancetype)initWithPath:(NSString*)path {
                     char seg_name[17] = {};
                     memcpy(seg_name, cmd->segname, 16);
                     NSString *segmentKey = [NSString stringWithUTF8String:seg_name];
+                    if (cmd->flags & SG_PROTECTED_VERSION_1) {
+                        // FIXME, implement protected executables
+                        // https://github.com/DerekSelander/dsdump/issues/6
+                        printf("%s is protected, come again at a later beta\n", cmd->segname);
+                        exit(1);
+                    }
                     self.segmentCommandsDictionary[segmentKey] = @((uintptr_t)cmd);
                     
                     for (int j = 0; j < cmd->nsects; j++) {