diff --git a/src/mathed/ChangeLog b/src/mathed/ChangeLog
index 002a111a0c..fb8f912d1d 100644
--- a/src/mathed/ChangeLog
+++ b/src/mathed/ChangeLog
@@ -1,3 +1,9 @@
+2005-03-30  Georg Baum  <Georg.Baum@post.rwth-aachen.de>
+
+	* math_amsarrayinset.[Ch] (validate): new, require amsmath
+	* math_substackinset.[Ch] (validate): ditto
+	* math_arrayinset.[Ch] (validate): ditto (in the case of subarray)
+
 2005-03-02  Georg Baum  <Georg.Baum@post.rwth-aachen.de>
 
 	* math_parser.C (parse1): Don't parse "\|" following a "\left" or
diff --git a/src/mathed/math_amsarrayinset.C b/src/mathed/math_amsarrayinset.C
index 3223277ddb..3c68332a0b 100644
--- a/src/mathed/math_amsarrayinset.C
+++ b/src/mathed/math_amsarrayinset.C
@@ -1,5 +1,6 @@
 #include <config.h>
 
+#include "LaTeXFeatures.h"
 #include "math_amsarrayinset.h"
 #include "math_mathmlstream.h"
 #include "math_metricsinfo.h"
@@ -90,3 +91,10 @@ void MathAMSArrayInset::normalize(NormalStream & os) const
 	MathGridInset::normalize(os);
 	os << ']';
 }
+
+
+void MathAMSArrayInset::validate(LaTeXFeatures & features) const
+{
+	features.require("amsmath");
+	MathGridInset::validate(features);
+}
diff --git a/src/mathed/math_amsarrayinset.h b/src/mathed/math_amsarrayinset.h
index e5d254a6ec..a4a4d64b62 100644
--- a/src/mathed/math_amsarrayinset.h
+++ b/src/mathed/math_amsarrayinset.h
@@ -33,7 +33,8 @@ public:
 	void write(WriteStream & os) const;
 	///
 	void normalize(NormalStream &) const;
-
+	///
+	void validate(LaTeXFeatures & features) const;
 private:
 	///
 	char const * name_left() const;
diff --git a/src/mathed/math_arrayinset.C b/src/mathed/math_arrayinset.C
index 266cc37bba..ff2fe21086 100644
--- a/src/mathed/math_arrayinset.C
+++ b/src/mathed/math_arrayinset.C
@@ -1,5 +1,6 @@
 #include <config.h>
 
+#include "LaTeXFeatures.h"
 #include "math_arrayinset.h"
 #include "math_parser.h"
 #include "math_mathmlstream.h"
@@ -110,3 +111,11 @@ void MathArrayInset::maplize(MapleStream & os) const
 	MathGridInset::maplize(os);
 	os << ')';
 }
+
+
+void MathArrayInset::validate(LaTeXFeatures & features) const
+{
+	if (name_ == "subarray")
+		features.require("amsmath");
+	MathGridInset::validate(features);
+}
diff --git a/src/mathed/math_arrayinset.h b/src/mathed/math_arrayinset.h
index 54f6f72e44..38173075fe 100644
--- a/src/mathed/math_arrayinset.h
+++ b/src/mathed/math_arrayinset.h
@@ -40,7 +40,8 @@ public:
 	void normalize(NormalStream &) const;
 	///
 	void maplize(MapleStream &) const;
-
+	///
+	void validate(LaTeXFeatures & features) const;
 private:
 	///
 	string name_;
diff --git a/src/mathed/math_substackinset.C b/src/mathed/math_substackinset.C
index 22d6877987..b8f3ae3b47 100644
--- a/src/mathed/math_substackinset.C
+++ b/src/mathed/math_substackinset.C
@@ -1,5 +1,6 @@
 #include <config.h>
 
+#include "LaTeXFeatures.h"
 #include "math_substackinset.h"
 #include "math_mathmlstream.h"
 #include "math_streamstr.h"
@@ -49,3 +50,10 @@ void MathSubstackInset::maplize(MapleStream & os) const
 	MathGridInset::maplize(os);
 	os << ')';
 }
+
+
+void MathSubstackInset::validate(LaTeXFeatures & features) const
+{
+	features.require("amsmath");
+	MathGridInset::validate(features);
+}
diff --git a/src/mathed/math_substackinset.h b/src/mathed/math_substackinset.h
index 041dbe7bac..915e0c640d 100644
--- a/src/mathed/math_substackinset.h
+++ b/src/mathed/math_substackinset.h
@@ -23,6 +23,8 @@ public:
 	void normalize(NormalStream &) const;
 	///
 	void maplize(MapleStream &) const;
+	///
+	void validate(LaTeXFeatures & features) const;
 };
 
 #endif