diff --git a/fltk-options/icons/fltk-options-32.xpm b/fltk-options/icons/fltk-options-32.xpm
index 1b44473fa..144967ba6 100644
--- a/fltk-options/icons/fltk-options-32.xpm
+++ b/fltk-options/icons/fltk-options-32.xpm
@@ -1,5 +1,5 @@
 /* XPM */
-static char *_bae769a99384303e21a66e415de0b1aBvKpx6NXTDEGsJa6[] = {
+static const char *_bae769a99384303e21a66e415de0b1aBvKpx6NXTDEGsJa6[] = {
 /* columns rows colors chars-per-pixel */
 "32 32 32 1 ",
 "  c #1A1C1C",
diff --git a/fltk-options/icons/fltk-options-96.xpm b/fltk-options/icons/fltk-options-96.xpm
index 31a903de6..56cce3612 100644
--- a/fltk-options/icons/fltk-options-96.xpm
+++ b/fltk-options/icons/fltk-options-96.xpm
@@ -1,5 +1,5 @@
 /* XPM */
-static char *_e101498a8b740e7b97aa74122d70714MqWFs5PhLjx31lZ1[] = {
+static const char *_e101498a8b740e7b97aa74122d70714MqWFs5PhLjx31lZ1[] = {
 /* columns rows colors chars-per-pixel */
 "96 96 32 1 ",
 "  c #1A1C1C",
diff --git a/fltk.xpm b/fltk.xpm
index b275af51e..78732f901 100644
--- a/fltk.xpm
+++ b/fltk.xpm
@@ -1,5 +1,5 @@
 /* XPM */
-static char * const fltk_xpm[] = {
+static const char * const fltk_xpm[] = {
 "229 70 152 2",
 "  	c None",
 ". 	c #000066",
diff --git a/fluid/icons/fluid-32.xpm b/fluid/icons/fluid-32.xpm
index 9fb63f5a6..24eb3bb26 100644
--- a/fluid/icons/fluid-32.xpm
+++ b/fluid/icons/fluid-32.xpm
@@ -1,5 +1,5 @@
 /* XPM */
-static char * const fluid_32_xpm[] = {
+static const char * const fluid_32_xpm[] = {
 "32 32 32 1",
 " 	c None",
 ".	c #000200",
diff --git a/fluid/icons/fluid-96.xpm b/fluid/icons/fluid-96.xpm
index 0e0b11d4e..bec9958d3 100644
--- a/fluid/icons/fluid-96.xpm
+++ b/fluid/icons/fluid-96.xpm
@@ -1,5 +1,5 @@
 /* XPM */
-static char * const fluid_96_xpm[] = {
+static const char * const fluid_96_xpm[] = {
 "96 96 32 1",
 " 	c None",
 ".	c #000100",