diff --git a/src/include/units/bits/ratio_maths.h b/src/include/units/bits/ratio_maths.h
index 2ef31bab..ead625f5 100644
--- a/src/include/units/bits/ratio_maths.h
+++ b/src/include/units/bits/ratio_maths.h
@@ -31,7 +31,7 @@
 #include <numeric>
 #include <tuple>
 #include <type_traits>
-#include <gsl/gsl_assert>
+#include <gsl/assert>
 
 namespace units::detail {
 
diff --git a/src/include/units/ratio.h b/src/include/units/ratio.h
index ff98b0bf..43042835 100644
--- a/src/include/units/ratio.h
+++ b/src/include/units/ratio.h
@@ -29,7 +29,7 @@
 #include <type_traits>
 #include <tuple>
 #include <algorithm>
-#include <gsl/gsl_assert>
+#include <gsl/assert>
 
 namespace units {
 
diff --git a/src/include/units/symbol_text.h b/src/include/units/symbol_text.h
index f38ee6f2..28c4fcb1 100644
--- a/src/include/units/symbol_text.h
+++ b/src/include/units/symbol_text.h
@@ -24,7 +24,7 @@
 
 #include <units/bits/external/fixed_string.h>
 #include <units/bits/external/hacks.h>
-#include <gsl/gsl_assert>
+#include <gsl/assert>
 #include <compare>
 
 namespace units {