2 files changed, 2 insertions, 2 deletions
diff --git a/src/XPM.cxx b/src/XPM.cxx
index 2a0399837..d1389efa0 100644
--- a/src/XPM.cxx
+++ b/src/XPM.cxx
@@ -38,7 +38,7 @@ static size_t MeasureLength(const char *s) {
 	return i;
 }
 
-ColourAllocated XPM::ColourFromCode(int ch) {
+ColourAllocated XPM::ColourFromCode(int ch) const {
 	return colourCodeTable[ch]->allocated;
 #ifdef SLOW
 	for (int i=0; i<nColours; i++) {
diff --git a/src/XPM.h b/src/XPM.h
index 71970a6b5..cb05aae3e 100644
--- a/src/XPM.h
+++ b/src/XPM.h
@@ -24,7 +24,7 @@ class XPM {
 	char codeTransparent;
 	char *codes;
 	ColourPair *colours;
-	ColourAllocated ColourFromCode(int ch);
+	ColourAllocated ColourFromCode(int ch) const;
 	void FillRun(Surface *surface, int code, int startX, int y, int x);
 	char **lines;
 	ColourPair *colourCodeTable[256];