diff --git a/tests/SearchSpaceGroupTest.cpp b/tests/SearchSpaceGroupTest.cpp
index c06b32acd..2e6361d8e 100644
--- a/tests/SearchSpaceGroupTest.cpp
+++ b/tests/SearchSpaceGroupTest.cpp
@@ -88,9 +88,9 @@ namespace {
                         .h = h,
                         .k = k,
                         .l = l,
-                        .I = absent ? 0.0 : SyntheticIntensityFromAsu(asu),
+                        .I = static_cast<float>(absent ? 0.0 : SyntheticIntensityFromAsu(asu)),
                         .sigma = 1.0,
-                        .d = CalcSyntheticD(h, k, l)
+                        .d = static_cast<float>(CalcSyntheticD(h, k, l))
                     });
                 }
             }
@@ -323,7 +323,8 @@ TEST_CASE("SearchSpaceGroup operator correlation reads symmetry, not the resolut
                     const double jitter = SyntheticIntensityFromAsu(gemmi::Op::Miller{{h, k, l}}) / 350.0;
                     const double I = 1.0e5 * falloff * jitter;
                     merged.push_back(MergedReflection{
-                        .h = h, .k = k, .l = l, .I = I, .sigma = I / 20.0, .d = d});
+                        .h = h, .k = k, .l = l, .I = static_cast<float>(I),
+                        .sigma = static_cast<float>(I / 20.0), .d = static_cast<float>(d)});
                 }
         return merged;
     };