diff --git a/doc/ca65.sgml b/doc/ca65.sgml
index 0aa1b33cc..4b45a6c5c 100644
--- a/doc/ca65.sgml
+++ b/doc/ca65.sgml
@@ -107,6 +107,7 @@ Long options:
   --cpu type		Set cpu type
   --debug-info		Add debug info to object file
   --feature name	Set an emulation feature
+  --forget-inc-paths    Forget include search paths
   --help		Help (this text)
   --ignore-case		Ignore case of symbols
   --include-dir dir	Set an include directory search path
@@ -153,6 +154,13 @@ Here is a description of all the command line options:
   command for a list of emulation features.
 
 
+  <tag><tt>--forget-inc-paths</tt></tag>
+
+  Forget the builtin include paths. This is most useful when building
+  customized assembler modules, in which case the standard header files should
+  be ignored.
+
+
   <label id="option-g">
   <tag><tt>-g, --debug-info</tt></tag>
 
diff --git a/src/ca65/incpath.c b/src/ca65/incpath.c
index 124e4b20b..d3fd72ea3 100644
--- a/src/ca65/incpath.c
+++ b/src/ca65/incpath.c
@@ -76,6 +76,14 @@ char* FindInclude (const char* Name)
 
 
 
+void ForgetAllIncludePaths (void)
+/* Remove all include search paths. */
+{
+    ForgetAllSearchPaths (INC_STD);
+}
+
+
+
 void InitIncludePaths (void)
 /* Initialize the include path search list */
 {
diff --git a/src/ca65/incpath.h b/src/ca65/incpath.h
index 41891c9b8..b4942ab4d 100644
--- a/src/ca65/incpath.h
+++ b/src/ca65/incpath.h
@@ -52,6 +52,9 @@ char* FindInclude (const char* Name);
  * the complete path, if found, return 0 otherwise.
  */
 
+void ForgetAllIncludePaths (void);
+/* Remove all include search paths. */
+
 void InitIncludePaths (void);
 /* Initialize the include path search list */
 
diff --git a/src/ca65/main.c b/src/ca65/main.c
index faec11ecf..3ec6c16a3 100644
--- a/src/ca65/main.c
+++ b/src/ca65/main.c
@@ -108,6 +108,7 @@ static void Usage (void)
             "  --cpu type\t\tSet cpu type\n"
             "  --debug-info\t\tAdd debug info to object file\n"
             "  --feature name\tSet an emulation feature\n"
+            "  --forget-inc-paths\tForget include search paths\n"
             "  --help\t\tHelp (this text)\n"
             "  --ignore-case\t\tIgnore case of symbols\n"
             "  --include-dir dir\tSet an include directory search path\n"
@@ -375,6 +376,15 @@ static void OptFeature (const char* Opt attribute ((unused)), const char* Arg)
 
 
 
+static void OptForgetIncPaths (const char* Opt attribute ((unused)),
+                               const char* Arg attribute ((unused)))
+/* Forget all currently defined include paths */
+{
+    ForgetAllIncludePaths ();
+}
+
+
+
 static void OptHelp (const char* Opt attribute ((unused)),
 		     const char* Arg attribute ((unused)))
 /* Print usage information and exit */
@@ -774,6 +784,7 @@ int main (int argc, char* argv [])
         { "--cpu",     	       	1,	OptCPU 			},
 	{ "--debug-info",      	0,	OptDebugInfo		},
 	{ "--feature",		1,	OptFeature		},
+       	{ "--forget-inc-paths",	0,     	OptForgetIncPaths       },
 	{ "--help",    		0,	OptHelp			},
 	{ "--ignore-case",     	0,	OptIgnoreCase 		},
 	{ "--include-dir",     	1,	OptIncludeDir		},