diff --git a/doc/ca65.sgml b/doc/ca65.sgml
index 4a14d0276..af762b90a 100644
--- a/doc/ca65.sgml
+++ b/doc/ca65.sgml
@@ -92,6 +92,7 @@ Short options:
   -U                            Mark unresolved symbols as import
   -V                            Print the assembler version
   -W n                          Set warning level n
+  -d                            Debug mode
   -g                            Add debug info to object file
   -h                            Help (this text)
   -i                            Ignore case of symbols
@@ -108,6 +109,7 @@ Long options:
   --cpu type                    Set cpu type
   --create-dep name             Create a make dependency file
   --create-full-dep name        Create a full make dependency file
+  --debug                       Debug mode
   --debug-info                  Add debug info to object file
   --feature name                Set an emulation feature
   --forget-inc-paths            Forget include search paths
@@ -175,6 +177,12 @@ Here is a description of all the command line options:
   information to the assembler.
 
 
+  <tag><tt>-d, --debug</tt></tag>
+
+  Enables debug mode, something that should not be needed for mere
+  mortals:-)
+
+
   <label id="option--feature">
   <tag><tt>--feature name</tt></tag>
 
diff --git a/src/ca65/main.c b/src/ca65/main.c
index f4aa4087c..bcc9e889e 100644
--- a/src/ca65/main.c
+++ b/src/ca65/main.c
@@ -1,4 +1,4 @@
-/*****************************************************************************/
+
 /*                                                                           */
 /*				    main.c				     */
 /*                                                                           */
@@ -42,6 +42,7 @@
 #include "addrsize.h"
 #include "chartype.h"
 #include "cmdline.h"
+#include "debugflag.h"
 #include "mmodel.h"
 #include "print.h"
 #include "scopedefs.h"
@@ -97,6 +98,7 @@ static void Usage (void)
             "  -U\t\t\t\tMark unresolved symbols as import\n"
             "  -V\t\t\t\tPrint the assembler version\n"
             "  -W n\t\t\t\tSet warning level n\n"
+            "  -d\t\t\t\tDebug mode\n"
             "  -g\t\t\t\tAdd debug info to object file\n"
             "  -h\t\t\t\tHelp (this text)\n"
             "  -i\t\t\t\tIgnore case of symbols\n"
@@ -113,6 +115,7 @@ static void Usage (void)
             "  --cpu type\t\t\tSet cpu type\n"
             "  --create-dep name\t\tCreate a make dependency file\n"
             "  --create-full-dep name\tCreate a full make dependency file\n"
+            "  --debug\t\t\tDebug mode\n"
             "  --debug-info\t\t\tAdd debug info to object file\n"
             "  --feature name\t\tSet an emulation feature\n"
             "  --forget-inc-paths\t\tForget include search paths\n"
@@ -407,6 +410,15 @@ static void OptCreateFullDep (const char* Opt attribute ((unused)),
 
 
 
+static void OptDebug (const char* Opt attribute ((unused)),
+	       	      const char* Arg attribute ((unused)))
+/* Compiler debug mode */
+{
+    ++Debug;
+}
+
+
+
 static void OptDebugInfo (const char* Opt attribute ((unused)),
 		     	  const char* Arg attribute ((unused)))
 /* Add debug info to the object file */
@@ -869,6 +881,7 @@ int main (int argc, char* argv [])
         { "--cpu",     	       	1,	OptCPU 			},
         { "--create-dep",       1,      OptCreateDep            },
         { "--create-full-dep",  1,      OptCreateFullDep        },
+       	{ "--debug",           	0,     	OptDebug     		},
 	{ "--debug-info",      	0,	OptDebugInfo		},
 	{ "--feature",		1,	OptFeature		},
        	{ "--forget-inc-paths",	0,     	OptForgetIncPaths       },
@@ -930,6 +943,10 @@ int main (int argc, char* argv [])
 	       	    LongOption (&I, OptTab, sizeof(OptTab)/sizeof(OptTab[0]));
 	       	    break;
 
+		case 'd':
+		    OptDebug (Arg, 0);
+		    break;
+
        	       	case 'g':
        	       	    OptDebugInfo (Arg, 0);
        	       	    break;
diff --git a/src/ca65/studyexpr.c b/src/ca65/studyexpr.c
index e5141702f..cef121223 100644
--- a/src/ca65/studyexpr.c
+++ b/src/ca65/studyexpr.c
@@ -37,7 +37,7 @@
 
 /* common */
 #include "check.h"
-#include "print.h"
+#include "debugflag.h"
 #include "shift.h"
 #include "xmalloc.h"
 
@@ -537,7 +537,7 @@ static void StudySymbol (ExprNode* Expr, ExprDesc* D)
             SymUnmarkUser (Sym);
 
             /* If requested and if the expression is valid, dump it */
-            if (Verbosity > 0 && !ED_HasError (D)) {
+            if (Debug > 0 && !ED_HasError (D)) {
                 DumpExpr (Expr, SymResolve);
             }