diff --git a/src/libs/utils/smallstring.h b/src/libs/utils/smallstring.h
index 1c6516a3c3a..6efe575e377 100644
--- a/src/libs/utils/smallstring.h
+++ b/src/libs/utils/smallstring.h
@@ -508,7 +508,6 @@ UNIT_TEST_PUBLIC:
     }
 
 private:
-    constexpr
     SmallString(Internal::StringDataLayout data) noexcept
         : m_data(data)
     {
diff --git a/src/libs/utils/smallstringliteral.h b/src/libs/utils/smallstringliteral.h
index 47c7dab33b4..a4b505a56b5 100644
--- a/src/libs/utils/smallstringliteral.h
+++ b/src/libs/utils/smallstringliteral.h
@@ -66,13 +66,11 @@ public:
     {
     }
 
-    constexpr
     const char *data() const
     {
         return Q_LIKELY(isShortString()) ? m_data.shortString.string : m_data.allocated.data.pointer;
     }
 
-    constexpr
     size_type size() const
     {
         return Q_LIKELY(isShortString()) ? m_data.shortString.shortStringSize : m_data.allocated.data.size;
@@ -104,13 +102,11 @@ public:
         return sizeof(Internal::ShortStringLayout) - 2;
     }
 
-    constexpr
     bool isShortString() const noexcept
     {
         return !m_data.shortString.isReference;
     }
 
-    constexpr
     bool isReadOnlyReference() const noexcept
     {
         return m_data.shortString.isReadOnlyReference;
@@ -122,7 +118,7 @@ public:
     }
 
 private:
-    constexpr SmallStringLiteral(Internal::StringDataLayout data) noexcept
+    SmallStringLiteral(Internal::StringDataLayout data) noexcept
         : m_data(data)
     {
     }
diff --git a/tests/unit/unittest/unittest.pro b/tests/unit/unittest/unittest.pro
index fe688043a35..f699b78ba3e 100644
--- a/tests/unit/unittest/unittest.pro
+++ b/tests/unit/unittest/unittest.pro
@@ -66,7 +66,7 @@ SOURCES += \
     chunksreportedmonitor.cpp \
     unsavedfiletest.cpp \
     clangisdiagnosticrelatedtolocationtest.cpp \
-#    smallstringtest.cpp \
+    smallstringtest.cpp \
     highlightingmarkstest.cpp \
     sizedarraytest.cpp \
     utf8positionfromlinecolumntest.cpp \