diff --git a/SignalsPanel.c b/SignalsPanel.c
index cb71130f..7e21ce93 100644
--- a/SignalsPanel.c
+++ b/SignalsPanel.c
@@ -6,8 +6,8 @@ in the source distribution for its full text.
 */
 
 #include "SignalsPanel.h"
+// the above contains #include <signal.h> so do not add that here again (breaks Solaris build)
 
-#include <signal.h>
 #include <stdbool.h>
 
 #include "FunctionBar.h"
diff --git a/SignalsPanel.h b/SignalsPanel.h
index 7b9303fe..529043a1 100644
--- a/SignalsPanel.h
+++ b/SignalsPanel.h
@@ -7,7 +7,11 @@ Released under the GNU GPLv2+, see the COPYING file
 in the source distribution for its full text.
 */
 
+#include "config.h" // IWYU pragma: keep
+
+#ifndef HTOP_SOLARIS
 #include <signal.h>
+#endif
 
 #include "Panel.h"